It's a known issue listed in the known issues section of release notes.
You can revert to 18.3.4 (which I'm using) or early or maybe even a couple later than that.
Anyhow, just revert using device manager, uninstalling your current version and installing older or trying a system restore.
If you search for mouse lag on here you'll find more posts.
ASUS TUF X570 wifi, AMD Ryzen 5 5600G, ASRock 6700XT Challenger, Antec Truepower new 700w. 32GB