This happened to me when in a Tile layout, with one window on the left and two on the right.
When dragging the border between the two windows on the right to resize them sometimes they get maximized horizontally and the left window gets reduced to zero width.
Unfortunately, I mainly use Tile layout with the master window on the left and two windows on the right. I don't know if this issue happens when the tile layout is rotated with one big horizontal window and two smaller ones over or under it.
Steps to Reproduce
Set tile layout
Have master window on the left and two small window on the right
Start dragging the horizontal border between the windows on the right up or down
Sometimes the master window gets its width set to 0 and the windows on the right get maximized horizontally
Expected behavior
The windows on the right should be resized vertically but not horizontally
Summary
This happened to me when in a Tile layout, with one window on the left and two on the right. When dragging the border between the two windows on the right to resize them sometimes they get maximized horizontally and the left window gets reduced to zero width.
Unfortunately, I mainly use Tile layout with the master window on the left and two windows on the right. I don't know if this issue happens when the tile layout is rotated with one big horizontal window and two smaller ones over or under it.
Steps to Reproduce
Expected behavior
The windows on the right should be resized vertically but not horizontally
Screenshots
No response
Bismuth version
3.1.2-1 amd64
KDE Plasma version
5.24.6
The platform KWin is running on
X11
Additional context
No response