I am running macOS 15 with WA 11.0.1 and I have a coworker running macOS 14.7.0 with WA 11.0.1. Both of us encounter the invisible cursor issue when a session is terminated. It almost seems like a 50/50 shot as to whether the cursor will disappear or not. When it happened to me today, I found that if I was able to successfully move the invisible cursor so I could click on any of the menus (Windows App, Edit, Connections, etc.) at the top of the screen, the cursor did reappear.
The cursor is only invisible while WA is the active (frontmost) app. If you click into another app or the Finder, the cursor is visible again. But if you return to WA, the cursor goes invisible again until you either quit or use the menu trick mentioned above to restore visibility.