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Asus GT-AX11000 - Firewall is blocking MQTT Port 1883

Level 7

after the update from Version to a newer firmware (, or ) i have some weird behaviour with my AX11000
because the firewall blocks the MQTT port :1883.
Its WAN port is connected to a Fritz Box for the internet connection.
Both router have there own IP range and are able to communitacte together.
I also can ping from network to network and also open webinterfaces on both.

The AX11000 network have a MQTT server with standard port :1883.
The Fritz Box network have a few devices that connect to this mqtt this server.
BUT the AX11000 's firewall blocks for some reason this 1883 port.
When i disable the firewall my devices connect to the mqtt server without any problems.
If i activate the firewall again the connection remains ?!
If I then disconnect the devices from the power and plug them in again, it is blocked again 😄

With the firmeware all works fine 😞

Can you please take a look at this?