RE: bug: some table header(?) output goes to stderr instead of stdout

Strange -- my version (2.3.10) dumps headers to stdout, not stderr

No not strange ;) stupid of me not to mention that I am still on el7 distribution (dovecot-2.2.36-8.el7.x86_64). But I think I will move to the vendor packages soon, now that centos8 is eol and only stream is available.