That was it, what weird default behavior, oddly enough I didn't have to ever use that setting before. I guess it has to be a new addition to the firewall.
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Show posts MenuQuote from: Monviech on September 28, 2023, 12:57:02 PM
I remember this:
(its german)
https://forum.opnsense.org/index.php?topic=35920.0
The solution was to enable "Advanced features: reply-to" with the VPN interface in the firewall rule that allows this port forward.