No, the problem is with display of list. Here's a video that demonstrates the issue.

Oh! Strange behavior indeed. However this is not PTB related so there's nothing we can do, maybe try on a different client.

Yes, it's probably telegram problem. It's the same in web. .It works fine when output looks like list. Can I force it to be displayed as list?

Sorry for getting back to you late. It's a bit hard for me to understand what you mean by that without looking at some actual code.

In this video you can see that when list returned by inline query method includes InlineQueryResultCachedVoice Telegram displays response as list of media with titles. Andin this case you can see title of audio sent as document. But when response does not include voice as in previous video Telegram displays it as gallery without titles and document becomes invisible. If you want to see source code:generate_inline_list generates response. But currently because audio does not work as intended bot does not support it.