Sieve_max_redirects setting

I’ve noticed a new problem with forwarding emails in Roundcube. The account has 7 “Redirect Message To” lines. It had been working but as of around November 2022 it stopped, and this message appeared in /home/user-data/mail/sieve/
roundcube: line 8: error: number of redirect actions exceeds policy limit (5 > 4).
In /etc/dovecot/conf.d/90-sieve.conf I found
#sieve_max_redirects = 4
So I uncommented it, changed it to 8 and restarted dovecot.
The problem went away and forwards work.
My questions are:

  1. Will this change survive an upgrade to MIAB?
  2. If not, how can I put in an override somewhere that will?

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