Firewall Issues with Inter VLAN communication with two Gateways

[hawxxer]

Maybe you could help me

The situation is:

Vlan 1 / untagged
10.0.0.1 -> Unifi cloud gateway ultra (Gateway to internet)
10.0.0.4 -> Opnsense-box lan connection (Also acts as gateway to internet via the wan port (different nic)

vlan 99
10.0.99.1 -> Unifi cloud gateway ultra (DHCP server)
10.0.99.2 -> Opnsense-box (this should be the default gateway in this vlan)

Homenetwork is managed mainly through unifi but I want the vlan 99 to use the opnsense box as gateway to the internet (it's going to be my vpn vlan that should not be routed via unifi but via the opnsense, because the cloud gateway ultra can't push gigabit openvpn but the opnsense box can, tested it works)

So vlan is defined in unifi with it's dhcp server, but default gateway for that vlan is 10.0.99.2
I want devices from vlan 1 and vlan 99 talk to each other. My PC (10.0.0.7) can ping devices in vlan 99 for example a docker vm on (10.0.99.141) but I can't enter ssh or any other port, as it gets blocked by opnsense firewall (see attachment). But I thought with the rules I allow every traffic through? The other way around works fine -> i can ping, ssh or open webservices from 10.0.99.141 on 10.0.0.7 or any oter device in that default vlan)

Can someone explain to me my issue? If I disable the firewall of opnsense completly it works, but i need nating for the wan interface and the firewall there.

Thank you very much in advance!

Images of settings: https://imgur.com/a/B73xYAy
If you need any further information, I will provide!