UE 5.8: AnimNotify dragging is broken on native Wayland

Summary

When trying to drag AnimNotifies in the Montage timeline, the AnimNotify snaps to the center of the screen and disappears completely when using Linux + Wayland.

What Type of Bug are you experiencing?

Editor

Steps to Reproduce

Open an animation sequence or montage in Persona. Add an AnimNotify. Click and hold to drag it to a different time. Observe that it disappears when the mouse is moved, and doesn’t come back when released.

Expected Result

The AnimNotify follows the cursor and is left in its location when the left mouse button is released.

Observed Result

The AnimNotify disappears from view completely.

Affects Versions

5.8

Platform(s)

Linux

Video

Additional Notes

UE 5.8.2, SDL 3.4.4, KDE Plasma Wayland. SDL_VIDEODRIVER=wayland.
PR here: https://github.com/EpicGames/UnrealEngine/pull/15143