Can't select overlapping brush on top of another selected brush, in Edit mode

[andreiagmu]

I'm having an issue with brush selection on Edit mode:

If I create a brush on top of another, enter Edit mode, select the bottom brush (so its edit gizmos are active), then try to select the brush on top of it, the top brush isn't selected.
I have to click somewhere outside the bottom brush (clicking the skybox, or clicking another not-overlapping brush) to first deselect it, only then I'm able to select the top brush.

On Place mode, the selection works as expected, I can select the top brush without a problem, even if the bottom brush is selected

This issue is happening with both the current master and 2021.2-update branches
I tested on Unity 2020.3 and 2021.2, the issue is happening on both versions

[andreiagmu]

A few workarounds for this issue:

• If I select both brushes on the Hierarchy view, I can edit either of them (at the same time).

• If I use Unity's Shift + D shortcut to deselect all gameobjects, I can quickly deselect the bottom brush, then click on the top one. That's closer to the behavior I was expecting.