Hot corner not working in XDMCP session

I can’t seem to get hot corner (or the hot-bottom-edge plugin) to work in an xdmcp session. Is this a known limitation?

The XServer is Cygwin/X running in fullscreen mode on Windows 11, connecting to a Debian 12.5 system. Everything else seems to work well. Placing the mouse in the hot corner does nothing. The hot corner works on an HDMI console on the Debian system.

I’d like to know if this is a known problem before escalating to the Cygwin/X list.