Pink tileset, I just created it, assets look fine

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Hi everybody, I’ve just created a Tileset by dragging a sprite texture to the Tile Palette and all the cells are pink. It is totally new, no renaming, no moving or whatever. I created the texture, imported as sprite (sliced by cell), created the Tileset and dragged the texture in. All the tile assets were properly created and their references to the images are correct. But the palette shows them as full pink. If I draw on the tilemap using such pink tiles, the correct image is shown on the tilemap.
It looks like a bug.

Using Unity 2020.2.1f1.

The tileset:
6649105--759469--Captura de pantalla 2020-12-22 125653.png

The tiles:
6649105--759472--Captura de pantalla 2020-12-22 125719.png

One of the tiles:
6649105--759475--Captura de pantalla 2020-12-22 125742.png

EDIT: I add another picture of the tileset prefab, when I open it:

I found something interesting: If I copy an old Tileset prefab and drag whatever into it, tiles look perfect; but if I create the Tileset prefab using the Create New Palette menu, that palette shows everything pink.

What does the warning triangle next to “Active Layer” in your first-posted pic say? Usually that pink signals some kind of material/shader problem. What you’re experiencing seems strange.

It says that editing the Tilemap in prefab mode has better performance than in scene.