Zorin doesn't detect other distributions on boot

Hi,
I have Zorin OS, Windows 10, and EndeavourOS on the same virtual boot disk, and in BIOS, it's set to Ubuntu.
When I install any distribution that doesn't belong to Ubuntu, Zorin doesn't detect it even after uncommented this line:
GRUB_DISABLE_OS_PROBER=false
And running sudo update-grub
In EndeavourOS, I uncommented the same line and updated grub, and all three systems appeared in the boot menu.
What is the cause of the problem?

When You type in Zorin in the Terminal sudo update-grub what Output do You get?

Just out of curiosity, where is your boot for Endeavour OS located? Is it on its own partition or what's the deal there?

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On the same disk

@applecheeks37 Question would be my next Question, too. On the Same Disk You wrote. But how did You partitioned it? And here: Where did You put the /boot/efi/ Part? Did You put that in the existing EFI-Partition or did You make an own one for it?

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