I’ve asked in Discord about 20 times and, much to my disappointment, received no answer.
I have a tilemap, grid, and tile palette set up. The tiles appear just fine in the tile palette, but when I go to click in the tilemap to paint with them, they don’t display. When I go to undo, an “undo paint” option is there, so it’s clearly painting them. When I click on the game window, the tiles display there. This poses a bit of an issue for me, because I cannot see what I’m painting in the tilemap. I’ve tried multiple fresh installs with different versions, I have created about 20 new projects, nothing works. Unity is running as administrator, and I haven’t touched a single setting for Unity.
What’s going on here?
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If it is possible, could you file a bug report with your project using the Unity Bug Reporter and post the case number here? This would include all the settings that may have caused the issue.
Without knowing much, could it be possible that the camera in your SceneView is not aligned to the Tilemap somehow (although I would find that unlikely with a default 2D setup)? When a Sprite (SpriteRenderer) is placed on the scene, does it get displayed?
It displays an empty square regardless of what the sprite actually is supposed to be. I haven’t changed any settings or moved anything around that I don’t understand : P so it is a purely default setup.
Dragged a sprite into the scene, this is all that it shows 
@APsychicToaster Could you please submit a simple project as this is really strange ? We will take a look asap.
Sent as Case 1170616. I made a new project and imported a single floor tile asset. The proper PPU needs to be 64 but I didn’t set it from 100 so the tile won’t align on the grid, but it should still draw regardless in the scene. It was done using an older Unity version but I’ve tried…pretty much all of them to the same result.
I have this exact problem. Anyone found a solution?
Could you post a screenshot of what you see and of your TilemapRenderer GameObject inspector?
One of reasons why they are not showing was that the TilemapRenderer GameObject was set to a particular Layer which was treated as Invisible. Other reasons would be that the SceneView camera has been zoomed in too close that the TilemapRenderer has been culled from being rendered.
I just ran into the same problem (using 2020.2.1f1). Clearing the GI Cache for the project and restarting Unity seems to have fixed it, but only for new tiles painted in the scene. Any tiles that were previously painted in the scene that only showed up in the Game tab view still do not render in the scene view.
Additional details: this problem surfaced after working in my project for a few days. At some point any new tilemaps added to the scene had this issue but existing tilemaps continued to work totally fine. I toggled between the tilemaps to see if anything was different in the inspector and was able to confirm that everything for the tilemap properties (at least via the UI) were exactly the same.
I struggled the same problem, was able to solve it by reducing tiles size to the half. Also, changing main camera scale works.