Sure,
All i did was,
1) create sprite collection
2) drag some textures in there and commit
3) change atlas format to png
4) create a sprite and select created collection and some sprite, it gives error.
I got screenshots:
capture 1 shows how the sprite looks like with the error(i havent been able to recreate the pink null texture)
capture 2 shows the error message when creating a new sprite using the broken collection
capture 3 shows the inspector view of the messed up sprite
capture 4 shows what gets created when setting atlas format to PNG
capture 5 shows the sprite collection settings
capture 6 shows the Unity texture format output which fixes everything