Hi,
I am having these issues since forever or since KDE 5.16.3 and I am wondering if its only me because noone else is mentioning these bugs.
Wobbly windows messed up
KDE Connect / notifications messed up
Bluetooth destroying systemtray
Connecting a Bluetooth device - Destroys Systemtray
Systray Before BT PS4 Controller Connected
Systray After BT PS4 Controller Connected
Open a terminal, type inxi -Fxxz, copy paste the outcome here between </> (see above for the correct key)
It might be something in your graphical part is not setup right.
KDE 5.16.3 is just a few weeks old so it can't be forever.
Have you tried with the default KDE theme "Breeze"?
To me it could all come to do a custom theme issue. So at least try replicating it with Breeze. 
yeap the same things are happening with Breeze
Here is my inxi
[wolfyrion@wpc ~]$ inxi -FxZ
System: Host: wpc Kernel: 5.2.2-1-MANJARO x86_64 bits: 64 compiler: gcc v: 9.1.0 Desktop: KDE Plasma 5.16.3
Distro: Manjaro Linux
Machine: Type: Desktop Mobo: ASRock model: X399 Professional Gaming serial: <root required>
UEFI [Legacy]: American Megatrends v: P3.50 date: 12/24/2018
CPU: Topology: 16-Core (2-Die) model: AMD Ryzen Threadripper 1950X bits: 64 type: MT MCP MCM arch: Zen rev: 1
L2 cache: 8192 KiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm bogomips: 230038
Speed: 1856 MHz min/max: 2200/3600 MHz Core speeds (MHz): 1: 2143 2: 2040 3: 1749 4: 2333 5: 1954 6: 1980 7: 2336
8: 2788 9: 2522 10: 2063 11: 2086 12: 3342 13: 2128 14: 1996 15: 2792 16: 2793 17: 1828 18: 2523 19: 1978 20: 1825
21: 2462 22: 1921 23: 1990 24: 2085 25: 2797 26: 2618 27: 1992 28: 2626 29: 2337 30: 1839 31: 2337 32: 1880
Graphics: Device-1: NVIDIA GP102 [GeForce GTX 1080 Ti] vendor: ZOTAC driver: nvidia v: 430.26 bus ID: 43:00.0
Display: x11 server: X.Org 1.20.5 driver: nvidia
resolution: 2560x1440~60Hz, 1920x1080~60Hz, 1920x1080~60Hz, 1920x1200~60Hz
OpenGL: renderer: GeForce GTX 1080 Ti/PCIe/SSE2 v: 4.6.0 NVIDIA 430.26 direct render: Yes
Audio: Device-1: Advanced Micro Devices [AMD] Family 17h HD Audio vendor: ASRock driver: snd_hda_intel v: kernel
bus ID: 0a:00.3
Device-2: NVIDIA GP102 HDMI Audio vendor: ZOTAC driver: snd_hda_intel v: kernel bus ID: 43:00.1
Device-3: Focusrite-Novation Scarlett 18i8 2nd Gen type: USB driver: snd-usb-audio bus ID: 3-2:2
Sound Server: ALSA v: k5.2.2-1-MANJARO
Network: Device-1: Aquantia AQC107 NBase-T/IEEE 802.3bz Ethernet [AQtion] vendor: ASRock driver: atlantic v: 2.0.4.0-kern
port: N/A bus ID: 03:00.0
IF: enp3s0 state: up speed: 1000 Mbps duplex: full mac: 70:85:c2:54:06:66
Device-2: Intel I211 Gigabit Network vendor: ASRock driver: igb v: 5.6.0-k port: 2000 bus ID: 04:00.0
IF: enp4s0 state: up speed: 1000 Mbps duplex: full mac: 70:85:c2:54:06:62
Device-3: Intel Dual Band Wireless-AC 3168NGW [Stone Peak] driver: iwlwifi v: kernel port: 2000 bus ID: 05:00.0
IF: wlp5s0 state: down mac: 62:fd:0f:77:04:42
Device-4: Intel I211 Gigabit Network vendor: ASRock driver: igb v: 5.6.0-k port: 1000 bus ID: 06:00.0
IF: enp6s0 state: up speed: 100 Mbps duplex: half mac: 70:85:c2:54:06:64
Drives: Local Storage: total: 17.07 TiB used: 12.57 TiB (73.6%)
ID-1: /dev/nvme0n1 vendor: Samsung model: SSD 970 PRO 1TB size: 953.87 GiB
ID-2: /dev/nvme1n1 vendor: Samsung model: SSD 960 PRO 512GB size: 476.94 GiB
ID-3: /dev/nvme2n1 vendor: Samsung model: SSD 960 PRO 512GB size: 476.94 GiB
ID-4: /dev/sda vendor: Western Digital model: WD40EFRX-68WT0N0 size: 3.64 TiB
ID-5: /dev/sdb vendor: Samsung model: SSD 850 PRO 256GB size: 238.47 GiB
ID-6: /dev/sdc vendor: Western Digital model: WD40EFRX-68WT0N0 size: 3.64 TiB
ID-7: /dev/sdd vendor: Seagate model: ST10000DM0004-1ZC101 size: 9.10 TiB
RAID: Device-1: md0 type: mdraid status: active Components: online: nvme1n1~c0 nvme2n1~c1
Info: raid: raid-0 blocks: 999952384 report: N/A chunk size: 512k
Partition: ID-1: / size: 937.89 GiB used: 364.24 GiB (38.8%) fs: ext4 dev: /dev/nvme0n1p1
ID-2: /tmp size: 233.73 GiB used: 64.51 GiB (27.6%) fs: ext4 dev: /dev/sdb1
Sensors: System Temperatures: cpu: 45.0 C mobo: N/A gpu: nvidia temp: 55 C
Fan Speeds (RPM): N/A gpu: nvidia fan: 33%
Info: Processes: 597 Uptime: 4h 13m Memory: 31.33 GiB used: 7.09 GiB (22.6%) Init: systemd Compilers: gcc: 9.1.0
clang: 8.0.1 Shell: bash v: 5.0.7 inxi: 3.0.35
[wolfyrion@wpc ~]$
Compositor settings?
Same as yours except allow apps to block compositor...
If you create a second user account & switch to it, does the misbehaviour replicate?
If you boot from a LiveISO/USB, does the misbehaviour replicate?
yeap is doing it on the new user as well.
At the start the bluetooth bug was not happening but after adding in systray some applications and connected PS4 a couples of times it crashed the system tray again.
Fot wobbly windows if you click advanced and max everything to the right you will see an amazing effect lol
I am thinking to try a different distro just to check if this behaviour is happening only in Manjaro
I have checked the wobbly effects on my laptop with Intel Graphic card and is having the same bug as my main pc with Nvidia.
I have install Arch on another PC with a cheap old nvidia and Wobbly effect is working fine.
So none of you that are using Manjaro Plasma is having this problem with wobbly effects????
This drives me nuts . How come 2x different laptops with the same Manjaro installation having the same problem with different pcs and none of you is having this problem...
All my compositing effects, ie including WW, continue to work just fine in my Manjaro Lappy & Manjaro Tower. FYI.
Same here.
Could this be a theming issue? I'm using default breath theme.
Unless you are running the *-git version of kde all the plasma packages come directly upstream from arch so this is exceedingly strange. Is the plasma version the same on your arch machine as manjaro?
It looks like there are newer plasma packages in the testing branch. You might try switching to testing if you haven't already.
UGH! I think I got motion sickness from that. 
FWIW, I'm on testing with two machines using KDE. One with AMD GPU, the other nvidia gpu.
I do not have these issues.
They are both using the Arc Dark Theme btw.
I am not using any git version and I am on unstable repo, anyway is very strange...
I will wait for the latest NVIDIA drivers and the new upcoming KDE hopefully these updates will fix my issues.
Just an update on this...
I have tested arch on my machine and I have the same problems.
I guess is a Plasma thing , most propably a KWIN bug or some apps I am using that is causing this.
Well the good thing is that I have tested timeshift and I am amazed that it restored everything as it was 
I have also experienced the ps4 bluetooth-on/systray bug. While not backed by science. You may have some success by disabling the ps4 touchpad as a workaround.
My findings:
ps4 touchpad enabled & touchpad widget hidden: It happens by chance. Though hot streaks are possible.
ps4 touchpad enabled & touchpad widget shown: It seems to crash each time.
When I disable ps4 touchpad it seems to work fine (without any crashes yet).
Thank you very much , that is working fine so far 
about wobbly windows bug it will be fixed on version 5.17
Reported the problem here
https://bugs.kde.org/show_bug.cgi?id=411092
Patch here
https://phabricator.kde.org/D23774
This does not happen for me. I'd not heard of it til your post. 
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