Is this a duplicate of the other thread?

Thanks for answering Lionel!

Lionel Gallat answered this below :)

Possibly, but not at the moment. If you really want that, open a new topic on it :)

Thanks for testing further :)
Which mesh is broken how?
In what way did you "put instances in a bunch"?
Which modifier did you add?

Seems to work fine for me. However, it will only mask the primary directional light, not point lights or multiple directional lights. Perhaps you have an additional dir light you just haven't noticed yet?

This is now (finally) implemented in Beta 0.23 :)

This is now (finally) implemented in Beta 0.23 :)