Russian TTS
Russian TTS has a very annoying bug: the sequence of Cyrillic characters "на " (i.e. "н", "а" and space) pronounced something like “date nom” plus something else that cannot be expressed in any existing alphabet except IPA :-). Apple support suggested me to upgrade my devices (iPhone and iPad) to the latest 15.0.2 which I did. It didn't help.
The above sequence met in Russian as frequently as English "on " (i.e. "o", "n" and space) - so you can imagine how annoying this bug is.
Support team created two cases about this: but I cannot trace it.
I saw similar question by user genixg.
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iPad, iPadOS 15