Basic question: How to debug sieve scripts (e.g. via log file)?

Dear all,

I am a long time user of Cyrus imapd, but from time to time, there are 
new questions. The following might be embarrassing for me, but here we go:

During the last days, I have put some time into trying to find out how 
to debug sieve scripts as they are executed. One of my scripts doesn't 
behave as expected; it would help if I could see in the log files what 
the problem is.

However, I didn't find out how to make Cyrus imapd output something 
sieve-related into the log files at all. I also didn't find a standalone 
test program for sieve scripts in the Cyrus packages.

Starting cyrmaster in debug mode (-D) or activating the debug mode in 
cyrus.conf didn't help either; no sieve-related messages were in the 
terminal or in the log files.

In this case, I am on Debian bullseye with the stock Cyrus imapd 3.2.6.

I have realized that Debian bullseye offers a package called 
"dovecot-sieve" which contains a program called "sieve-test". However, I 
believe that the dovecot sieve utilities cannot be used to process or 
test sieve scripts for Cyrus imapd; please correct me if I am wrong.

Could anybody please shortly explain how I could make Cyrus imapd put 
sieve-related messages into the log files, or how I could debug sieve 
scripts in general?

Thank you very much in advance, and best regards,

Binarus

P.S. I am aware that Cyrus' sieveshell throws errors if a script 
contains syntax errors. But that's not what I am after. I'd like to gain 
a little insight into how the scripts behave at runtime, or at least see 
errors that occur as they are executed.

P.P.S. I know that my version is old. If somebody proposes an upgrade, 
it would be very nice to know whether debugging sieve scripts is 
possible with the proposed version. The reason is that upgrading to a 
new version in Debian generally means compiling that version. For 
various reasons, that is often a real hassle; I'd only like to do it if 
I knew that the situation regarding sieve debugging has changed.

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