OnTriggerEnter not firing

I have two objects set up with mesh colliders as triggers. their OnTriggerEnter has stopped firing for each other. they still fire for everything else, just not each other.

Why could this be? Dont be ashamed of patronising me (too much) im new to unity

Mesh colliders cannot collide with other Mesh colliders unless one of them is marked convex.

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thanks. just tried it both ways, no difference.

EDIT: set them BOTH to convex. that fixed it. thanks