Termix SSH agent forwarding creates broken SSH_AUTH_SOCK (ssh-add: communication with agent failed)

I'm trying to get SSH agent forwarding working with Termix, but I'm hitting a strange issue. The setting is turned on in the GUI. Testing below done on both app and web interface. Same results. Setup: Termix v2.5.0 running in Docker Ubuntu 22.04 hosts OpenSSH client 8.9p1 Target is GitLab in this example, but same error on different targets. Agent forwarding works perfectly from Tabby: ssh-add -L ssh-ed25519 AAAA... ~/.ssh/id_ed25519 However, from a Termix terminal session: echo $SSH_AUTH_SOCK /tmp/ssh-XXXX