Reproduction steps:
1. Open user's attached project
2. Open scene "Map-A" and the Tile Palette window
3. In the Tile Pallet window, select the Brush tool and pick one of the tiles inside "Tilemap"
4. Drag your cursor around the Scene window
-- observe crash

Reproducible with: 2018.4.26f1, 2019.4.9f1, 2020.1.4f1, 2020.2.0a21

Note:
-Tiles flicker when moving the brush around the Scene.
-In 2018.4, the editor crashes with these first lines:
0x00000001406AB212 (Unity) RenderNodeQueue::Reset
0x00000001406A4189 (Unity) RenderNodeQueue::~RenderNodeQueue
0x000000014064C642 (Unity) SharedObject<SharedRendererScene,1,SharedObjectDeleteReleaseOp<SharedRendererScene> >::Release
0x00000001406423B0 (Unity) CullResults::~CullResults