"tilemap layers" and "navigation region"

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1

When I click on bake navigation polygon it removes the collision of a tile only when that tile is inserted on layer 0, otherwise it does not remove it

2

This is a limitation, see here, it’s improved in 4.3, but limitation will remain in 4.2 and 4.1

3

Still not working

4

Did you build 4.3 yourself just now?