Tile removed from tilemap if single color

OS: Ubuntu 24.04.3 LTS x86_64
Kernel: 6.14.0-37-generic
Aseprite: 1.3.16.1-x64

Hello,
When I want to apply a tile with a solid color, it does not stay in place and is automatically cut out on the canvas.
The tile index doesn’t change anything, whether it’s the first or the last. It only seems that way because there’s only one color in the tile.

Here is an example:

example

Thanks in advance.
Regards,

Chris.