Tiles disappear as new tiles load once the max number of tiles is reached. A way to test this is to make the browser window fullscreen and press CMD-minus to shrink the size of the content until tiles are about 64x64. Tiles load from the center of the screen and begin disappear as too many tiles load. This is somewhat of an edge case, but I run up against it regularly when examining tilesets.
Tiles disappear as new tiles load once the max number of tiles is reached. A way to test this is to make the browser window fullscreen and press CMD-minus to shrink the size of the content until tiles are about 64x64. Tiles load from the center of the screen and begin disappear as too many tiles load. This is somewhat of an edge case, but I run up against it regularly when examining tilesets.
Examples: