Tiled X axis and grid break the fill tool

Using the “tiled X axis” setting with the grid enabled doesn’t let me use the fill tool all the time. (pictured above)

Other notes:
My grid is 24x24 but doesn’t seem to change anything
My color mode is indexed but it still happens with RGB color
I’m using Aseprite v1.2.17-x64.exe

From what I can tell I can only use the fill tool in the area marked green bellow and I don’t think this is intended behavior.
(this is posted in a reply because of the 1 image limit)