It's good if reverting to this driver version helped you, but it helps in cases where the operating system is not in Russian, Ukrainian, Belarusian, Bulgarian or Arabic.
I don't know how the system language and the dwm.exe process leak are related here on this driver version, but I have personally tested in all the above mentioned languages, but no leakage was observed in any other system language. I also ran a remote session with technical support and an Intel engineer and we tested different versions of the driver. The problem was observed, but they could not identify the root of the problem as to why it was happening. Most likely the problem is indeed on the MS side, as I encountered this problem after the 20H2 update in October 2020, with no problems detected since I bought the i7-10700 in September before the 20H2 update.