Document extensions like .pages, .txt, and .keynote constantly pop up on files in Finder and other folders despite manually removing them, deselecting the preference in Finder preferences, as well as turning on "hide extension" in the specific document's "Get Info" tab. This seems to have occurred after a macOS software update and has been a continuous issue through several subsequent macOS software updates.
MacBook Air 13″, macOS 15.6
My colleague @ BDAqua is most probably spot on / correct
At least correct in that, on my 3 different computers running Sequoia 15.6.1
Hide File Extensions not maintained since… - Apple Community
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To be forwards about this issue
This late in the development of Sequoia is probably waining
Most likely, the Apple Resources have probably been shifted to the final touches to the yesterday to be released macOS 26 Tahoe
Seems to me that I read it was due to syncing via iCloud.
+1
There are several threads about this and the common factor is icloud.
Document Extensions Continuously Showing Despite Removal
