Cannot select UV faces of a cube with Per-Face UV mode in viewport

[Cubouse]

What are you trying to do, and what do you expect to happen?

Selecting UV faces of a cube with the Per-face UV mode by clicking on the faces in the viewport.

What happens instead?

The UV faces are only selectable when I had another element selected in the outliner, or no element.

So if I have one (or multiple) UV face of a Per-Face cube selected, clicking any of the faces in the viewport will deselect all of them.
The cube element will be selected in the Outliner though.

Model format in which the issue occurs

Bedrock enitty

Blockbench variant

Program

Blockbench version

4.12.0 Beta 2

Operating System

W10

Installed Blockbench plugins

N/A