Dynamic security plugin does not save changes

[PeterLecky]

I am on Ubuntu 2022.4 and running mosquitto 2.0.18-0mosquitto1~focal1 from repo at:
http:https://ppa.launchpad.net/mosquitto-dev/mosquitto-ppa/ubuntu
It seems that changes made via dynamic-security api are properly handled and stored in memory, but the json file is not updated (all created users/groups/acls are lost after restart of the daemon).
Relevant part of config:

global

per_listener_settings false
allow_anonymous false
autosave_interval 60
user mosquitto
log_type all
plugin /usr/lib/x86_64-linux-gnu/mosquitto_dynamic_security.so
plugin_opt_config_file /etc/mosquitto/dynamic-security.json

File permissions of json file:
-rw-rw---- 1 mosquitto mosquitto 149194 Sep 6 2023 dynamic-security.json

There is nothing in the log regarding troubles with saving the json file.
Please let me know if I can add more information.
Thanks
Peter

[PeterLecky]

Good evening,
I found #2967. It is necessary to have also writable access for mosquitto user to directory where is json file stored. This changed probably in 2.16 version, it was not required by older versions. I didn't see that in changelogs, so keeping this opened please documment it in documentation if you believe that it should be mentioned for other users.