Issues detecting secondary OS (Tumbleweed)

I always keep a secondary OS on my laptop as a backup/experiment. Today I deleted Fedora and replaced it with openSUSE Tumbleweed, setup with a btrfs filesystem and without a bootloader (with other distros the Manjaro GRUB took care of all boot entries without issues). On Manjaro though, os-prober detects Tumbleweed, then update-grub also detects Tumbleweed, but it does not appear in the GRUB menu, nor in Grub-customizer, which I opened as a last resort. I thought it might be related to btrfs but even installing the package grub-btrfs didn't help. Here is the result of the two commands:

$sudo os-prober               
[sudo] password for big: 
/dev/sda4:openSUSE Tumbleweed:openSUSE:linux:btrfs:UUID=f60a0956-c018-48c6-b185-5b9b05c5dbbb:subvol=@/.snapshots/1/snapshot
$ sudo update-grub
Generating grub configuration file ...
Found theme: /usr/share/grub/themes/manjaro/theme.txt
Found linux image: /boot/vmlinuz-5.4-x86_64
Found initrd image: /boot/intel-ucode.img /boot/initramfs-5.4-x86_64.img
Found initrd fallback image: /boot/initramfs-5.4-x86_64-fallback.img
Found linux image: /boot/vmlinuz-4.19-x86_64
Found initrd image: /boot/intel-ucode.img /boot/initramfs-4.19-x86_64.img
Found initrd fallback image: /boot/initramfs-4.19-x86_64-fallback.img
Found openSUSE Tumbleweed on /dev/sda4
Found linux image: /boot/vmlinuz-5.4-x86_64
Found initrd image: /boot/intel-ucode.img /boot/initramfs-5.4-x86_64.img
Found initrd fallback image: /boot/initramfs-5.4-x86_64-fallback.img
Found linux image: /boot/vmlinuz-4.19-x86_64
Found initrd image: /boot/intel-ucode.img /boot/initramfs-4.19-x86_64.img
Found initrd fallback image: /boot/initramfs-4.19-x86_64-fallback.img
Found openSUSE Tumbleweed on /dev/sda4

Any clue on how to solve this?

EDIT: I kinda solved the problem by reinstalling GRUB from OpenSUSE. After this grub sees also manjaro and it's possible to make Manjaro the default option and even to install the manjaro grub theme. Still, this works for me but complicates things and is not a solution for manjaro.

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