StaticMeshEditor - "Generate UV" tool no longer works

1. Open a UE4.26 project.
2. Enable the polygon editing plugin from Edit>Plugins
3. Find a StaticMesh asset and open the StaticMesh editor.
4. In the top toolbar, open the dropdown menu under the "UV" button and select "Generate UVs"

Result: a new empty window will open with the text "unrecongized tab".

Expected: The UV generation tool opens correctly.

[UE-23848] Bug Status

i have this problem UE4CC-Windows-58DC12AF4B97F057BD108FBFF569B2E9_0000

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