From official documentation:
https://www.zabbix.com/documentation/7.4/en/manual/appendix/install/timescaledb
The timescaleDB setup is from official source:
https://docs.tigerdata.com/self-hosted/latest/install/installation-linux/#install-and-configure-timescaledb-on-postgresql

Every time a new TS version is released and Zabbix vendor is not yet tested and whitelisted the extensions, the new users will fail to setup the product and will be forced to learn the flag "AllowUnsupportedDBVersions=1"

A suggestion can be to validate the maximum possible supported TS version inside "postgresql/timescaledb/schema.sql".