I am able to reproduce both behaviors on my iPhone iOS 26.3.1(a), Anki 25.09.
I note that when the “answer-buttons-missing-grade-labels-and-don’t-work” bug occurs:
- A workaround is to go back to the Decks screen and re-enter/study the deck from there. Doing so seems to eliminate the bug for the remainder of the study session.
- It is also possible to answer by using the gear icon to expose the tools overlay, then select the desired action, for example “Answer Good”.
- If the Preferences->Review->Bottom Bar->Next Times setting is disabled, the bug appearance is slightly different. The grade labels do actually appear in the answer buttons. However, the answer buttons still don’t work.