Proxy port validation parsed the configuration with plain Symfony YAML,
which rejects Docker Compose tags such as !reset and !override. Proxy
start, restart and save then failed for these valid configurations, and
automatic start after a reboot stopped silently. v4.3.23 did not block
on such configurations.
The parser now reads custom tags and validates the values inside them,
so malformed ports are still rejected. CheckProxy refreshes the status
of a running proxy before it reads the configuration, as in v4.3.23, so
an unreadable configuration no longer hides a running proxy.
Andras Bacsai