TileMapLayer terrain problem with overlapping rectangles #112186
Description
Tested versions
Tested in 4.4.1 and the latest master branch
System information
Godot v4.4.stable - Windows 11 (build 26100) - Multi-window, 2 monitors - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1080 (NVIDIA; 32.0.15.6636) - Intel(R) Core(TM) i5-14500 (20 threads)
Issue description
Changing where I start drawing a second rectangle using the TileMapLayer terrain painting tools can cause completely different outcomes depending on where I start drawing.
Drawing this produces this result
Drawing this produces this result
Steps to reproduce
As per the screenshots above, draw different rectangles within the MRP at different places to produce very differennt results.
Minimal reproduction project (MRP)
I have an analysis and a PR on this coming. OP is just focused on the issue