This is closely related the issue I had before: https://powerusers.microsoft.com/t5/Building-Power-Apps/Using-2-different-SQL-sources-in-a-collection-Some-Columns-don-t/m-p/652393#M207697.
I now have 2 separate collections populating the same gallery depending on an If statement, but only one collection's fields are showing. They share almost all field names except for 2 fields that aren't in one of the collections. Strangely, this was working yesterday with no errors. I woke up this morning and found 41 errors. I wasted 4 hours trying to figure out the issue.
I could have a seperate gallery but that would cause a ton of duplicate code and extra work. Code management in PowerApps is already difficult as it ia.

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