GameMaker [SOLVED] Issue with instance_activate_layer()

[Jordan Robinson]

I am trying to deactivate all instances in the game except for those on the "Controllers" layer:

Spoiler: Calling Instance Draw Event ( inside if() statement )

instance_deactivate_all(true);
instance_activate_layer("Controllers");

All the instances are deactivated correctly, however the layer I want re-activated is not. If I individually activate the instances I want using instance_activate_object() it works fine...

Am I misunderstanding the use of instance_activate_layer()? My implementation appears to fit the description in the documentation

[EDIT - SOLUTION]

I didn't realise that my persistent objects in the "Controller" layer will not move automatically to the "Controller" layer in the next room. Resetting their layers in the room_start event solved the issue.