How many clients does the airport express support when bridging (ProxySTA)? The airport express is said to support 50 users, yet in my case (when bridging WiFi to ethernet) it only serves up to 4 clients on the LAN port. A fifth client is not able to obtain an IP address nor ARP requests or anything else. It's completely ignored by the airport express.

So: How many ethernet clients does the airport express support concurrently when bridging?

Note: This applies to bridged mode (ProxySTA) only, where one bridges an existing WiFi (connected to the internet) into an ethernet.
I get the same results. Only 4 clients receive an IP from the the main AP. Seems to be an undocumented hard limit on the Express when in client / proxysta mode