New sub menus appear as the old sub menu for a few frame before snapping and becoming correct

With the new context menus in Linux, mousing over an item that opens a sub menu will work correctly. But if you move down and select a sibling item that also has a sub menu, the menu with the size of the last sub menu will appear, but with content reflecting the current menu. This only lasts for a few frames before snapping to have the correct size and content.

Repro

1. Using Ubuntu 20.04 (X11 window server, may repro with Wayland as well), create a project.
2. In the hierarchy view, right click.
3. Mouse over "2D Object" and let the context menu appear.
4. Now move the mouse over "3D Object" and observe.

Result: Context menu with wrong size and content appears before "snapping" to be correct a few frames later

Expected: Context menu with the correct size and content appears without a visual break

Environment: Ubuntu 20.04 (X11), AMD GPU