Windows don't always fill the screen

[HiGein]

Screenshot 001.png shows how the tile extension handles 1 active window. You can notice window borders on all 4 dimensions of the window and you can also see window roundness.

This is not happening after manually pressing "Maximize" button. On the screenshot 002.png window is fully maximized without borders and roundness at the edges. However, if I minimize window and maximize it back, it still be not fully maximized.

"Remove window borders" option does not resolve the issue unfortunately, because in also removes title bar which is not desirable in my case.

This is not only aesthetic thing, this also affects usability. For example, when there is only 1 active window and tiling is enabled, I'm not able to close it using the very top right pixel. In this case resizing option appears, and I have to do a "aiming" to close the window :) Scrolling the window using the right corner also doesn't work when the single active window is handled by the tile extension, scrolling area begins a little bit more on the left.

I'm interested if there are some workarounds on this, like disabling window corners but enabling title bar.

$ plasmashell --version
plasmashell 5.17.4
$ kf5-config --version
Qt: 5.14.0
KDE Frameworks: 5.65.0
kf5-config: 1.0

[HiGein]

[faho]

This happens when the client has weird restrictions on its geometry (basicUnits, maximum size, minimum size), and your desktop size doesn't fit.