I don't know what happened, but WPS doesn't want to open files anymore under KDE Plasma. This is a clean install. I tried the workaround of appending -style gtk to the launcher (as I had gotten that advice before on here), but that doesn't help anymore.
The only output I get when clicking Open or pressing Ctrl+O is:
20:03:06 Downloads $ wps Unexpected value after '--separate-output'.
20:03:06 Downloads $ wps -style gtk Unexpected value after '--separate-output'.
However, dragging a file from Dolphin to WPS opens it just fine and everything works and it saves all of the changes like it should. So it seems to be confined to the Open File dialog functionality only. I know that I'm probably the only one experiencing this, as always, but I'm hoping to get some help in debugging this anyway. It's not a big deal having to use the Dolphin workaround, but the Open File dialog should work nonetheless.