Bug? Collider stops working upon game start

Issue: composite collider 2D (tilemap) doesn’t seem to be working in game mode, and I cannot even see the collider in the scene view when in game mode.

When not in game mode, the collider is visible and appears to be set up appropriately.

What could be causing this bug?

Scene view in editing mode:


Scene view in game mode:

Inspector for this 2D tilemap layer:

Bumping - has anyone ever encountered this issue?

Fixed this by redrawing ALL collider tiles. Not sure what the issue was but what a pain.