Thunderbird search on server seems broken: How to debug IMAP conversation?

I search in my IMAP folder Archive/2016 for the term "foo". There are several messages containing this word, but the search (ctrl-shift-f) tells me that there are not messages with this word in the body.

I use "search on server".

This looks like the IMAP server does retu the wrong results.

How can I debug this?

Is there a way in thunderbird that I can see the IMAP commands that get send to the server and the responses which I get?

Since the communication is encrypted wireshark does not help :-(

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