Learn Spelling Not Always Working

Scrivener Scrivener for macOS
1

I’ve been finding some strange behavior today regarding Learn Spelling.

I click on an incorrect word (red dots underneath it) and choose Learn Spelling:

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Nothing happens. Other strange behavior happens when I add letters to the word I attempted to learn the spelling of.

2

Also, this seems related to composition mode. Note that I’ve told Scriv to learn the spelling of the word “passout.” Here is the regular view vs the composition view. I’ve done nothing besides switch between them:

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