Hello,
not sure if anybody already run into this but Google added new "feature" that will add and activate (problably only in case you have all other input methods disabled) new input method - Google Autofill (com.google.android.gms/.autofill.service.AutofillInputMethodServiceProxy). At the moment only (and quick) way to disable it was to add whole com.google.android.gms to the Blocklist. In this first case customer is not using anything by google or from playstore so it's not a problem but I'm sure in many cases it would be.
If anyone has better idea how to block/disable/prevent/uninstall/etc it I'll be grateful but I just wanted to give you heads up