Downgraded from later versions 1.97.1/1.98.1 to 1.84.3 - Everything now works.
Another use had similar experiences (websocket timeouts over proxy and it seems latest version that works is 1.86.1
Looking at 1.87 - it seem to be API updates (and core etc..) so something potentially broke in 1.87.
I will close this case but file a bug report.