Strange error when changing Spotlight3D Projector texture during runtime, but not during _ready(): ; texture_remove_from_decal_atlas: Parameter "t" is null. about godot HOT 3 OPEN

After thinking the code through a bit, I found the the reason this happens (roughly):
On the change the old texture loses its last reference (RefCounted), and some internal of Light3D still using this will run into a missing reference because the reference already got cleaned up

So the fix would be keeping the current texture in memory by holding it in a var before changing light_projector to a new value or in this example it would also work to (pre)load the textures into the image1 and image2 vars (or an array) like

var image1 = preload("res://bobr.png") var image2 = preload("res://hegodh.png")

var new_image : CompressedTexture2D = image1

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Please try with 4.2.2 to confirm this still occurs on a supported version

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Issue is also there on 4.2.2

AwesomeAxolotl's fix works tho, altho I'm still not sure it should give the error in the original example

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