Until recently, my position profile for an application I use could be set to 100px wide. Recently, DisplayFusion will no longer reduce its width below 170px. This is the only dimension that I am having this issue with, the other 3 (height/x pos/y pos) seem fine. Manually resizing this window allows for the width to be reduced to only 40px wide, so this is not a width limitation of that window.

The app is quite large, so that would take a while on my rubbish internet connection. However, I can replicate the issue in any app generated with https://github.com/jiahaog/nativefier with it pointed at any webpage (at least the ones that I tested), and using the setting "--hide-window-frame" on the command line. Since this gives you a whole class of apps where this occurs, that might be more useful for bugtesting, and you can stare at the source code too. If that's not enough to work off or replicate the issue with, I can upload my specific app(s) where it occurs, it will just take me a few hours.