The problem is that I need to find a situation where it should work and does – like it works for you on Anki desktop – and compare that to a situation where it should work and doesn’t – like what you’re seeing on AnkiMobile. I was hoping that using your note type/card would make that easier. So far I haven’t been able to get it to work anywhere (i.e. the audio is always interrupted), so either that means I haven’t found the right situation yet, or it’s more broken than you thought! 
I was able to verify at least that there’s nothing obvious about your card that could be interfering. It has 2 audio files, on the back template, one after the other – and there’s no JavaScript on the card that could be causing issues.
{{Vocabulary-Audio}}
{{Sentence-Audio}}
Let’s see if someone with more experience with this feature has something more useful to add.
An open question that is unclear from the feature/docs – what is “answering” supposed to mean? Is disabling the feature intended to allow the audio to continue playing when switching from the front of a card to the back of a card (i.e. clicking Show Answer) – or when switching from the back of a card to the next card (i.e. clicking an “answer”-grading button)?
Other tangentially related posts –
Other than what you linked to on Reddit from 3y ago, I haven’t been able to find anyone who can’t get the setting to stop interrupting, but:
- User unable to get the setting to start interrupting – AnkiMobile, 4y ago – Interrupt current audio
- User unable to get the setting to start interrupting, fixed by rebooting – desktop, 6mo ago – Reddit - The heart of the internet