USG LITE60AX V2.30(ACIP.0)C0 Firmware release

I have issues reaching exactly one server from exactly one client PC.
The client is connected to our XMG1915-10EP, the server on LAN1 or LAN3 (tested) of the USG LITE 60AX. I cannot ping or RDP or use any other TCP/IP connection to the server from the client PC (but vice versa!). But if I connect the server to the switch it is working. I never had such problems, and they started directly after the firmware update. Even changing the IP reservation of the client, reboote or full power cycles of all devices did not help.
RDP to the server from WLAN or other LAN devices is working!
Will create support ticket directly via NCC and stop all firmware update for our customers till this issue is analysed and fixed.

Issues gone after downgrading to 2.20(ACIP.0) with Zyxel support. Will wait for and test with the next version.