Looking at the changes lists many Wayland patches: https://github.com/GloriousEggroll/proton-ge-custom/tree/master/patches/wine-hotfixes/pending/wine-wayland
Searching through that list for “cursor” returned 3 results.
- https://github.com/GloriousEggroll/proton-ge-custom/blob/master/patches/wine-hotfixes/pending/wine-wayland/0014-winewayland-Implement-SetCursorPos-via-pointer-lock.patch
- https://github.com/GloriousEggroll/proton-ge-custom/blob/master/patches/wine-hotfixes/pending/wine-wayland/0017-winewayland-Treat-fully-transparent-cursors-as-hidde.patch
- https://github.com/GloriousEggroll/proton-ge-custom/blob/master/patches/wine-hotfixes/pending/wine-wayland/0030-cursor-shape-v1.patch
Here’s the pull requests on the WINE HQ GitLab.
It’s probably this bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1955112
It’s a bug specifically on Wayland.
Try grabbing the tab and moving it and letting go, you don’t have to move it’s tab slot.