I think the opposite
You need the os-prober patched by Manjaro. That is what I use in my multi-boot system where all the systems are installed with btrfs. But mine are all in UEFI as well. Please see:
I think the opposite
You need the os-prober patched by Manjaro. That is what I use in my multi-boot system where all the systems are installed with btrfs. But mine are all in UEFI as well. Please see: