Yes, I had the same problem. MS changed something with the msstyles file and Explorer, and themes based on old msstyles files no longer work
I could no longer open the Recycle Bin, for example, or This PC (via shortcuts)
So I redid my theme with Msstyle Editor (since WSB doesn't support Windows 11 24h2) and no more problems.
may i ask how you do it? are you using base msstyle 23h2 or 24h2?