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Simply cant remove the saved PIN.

Edit the broadband profile->Mobile Broadband-> delete PIN->Save

Open again and the PIN is still there.

If I remove pin=.... from /etc/NetworkManager/system-connections/... it disappears also from the profile in c-c, but modem is still able to connect (even if I reattach the device), so does it mean PIN is cached somewhere?

Those changes are significant[1] and need to happen upstream first.

[1]: The whole mobile broadband part of the panel needs to be rethought, in fact...

After evaluating this issue, there are no plans to address it further or fix it in an upcoming release.  Therefore, it is being closed.  If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened.