Unable to write *.sieve files while Dovecot is running

[Ralph Seichter]

I noticed lately that I can no longer modify *.sieve files while Dovecot
is running. Write operations appear not to be permitted anymore:

  $ echo >> example.sieve
  zsh: permission denied: example.sieve

Text editors like vim cannot write either. Since I used to be able to
modify Sieve source files on the fly, I am wondering if the behaviour
I see nowadays is intentional?

Doveconf reports the following versions:

# 2.3.14.1 (9f0cfb6426): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.14 (1b5c82b2)
# OS: Linux 5.17.1-gentoo-r1-x86_64 x86_64 Gentoo Base System release 2.7

-Ralph