I found a 25,10 menu fix that works.
I replaced the: search -f $iso --set=root
line in my 25.10 menu with these lines:
# search -f $iso --set=root
set root='(hd0,gpt4)'
insmod part_gpt
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https://bugs.launchpad.net/bugs/2141060
Title:
25.10 doesn't support booting ubuntu isos
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