I’ve had this bug to a similar extent, where once properties is undocked from below the explorer, you can no longer dock it like that again (split top and bottom) and only just put them together as tabs on the same area. It’s mildly infuriating, slows my work down noticably and I haven’t found a way to reinstall studio entirely fresh so it goes back to normal.
At first I thought it was semi-intentional, or at least an “expected” result of the layout and how it works so I didn’t end up reporting it here. Everything on the left side has no troubles splitting into multiple parts like that, so it doesn’t make sense it can’t do it on the right.
I know this thread is really old, but I just wanted to say that this is still happening in studio and it’s very annoying. A workaround for this is to temporarily to into fullscreen mode inside of studio then dock the windows.