I had exactly the same issue with 24.1.0 when it was made available and I only have windows defender. Never figured out what was causing it so reverted back to 21.3.5, which works fine.
I’ve noticed this too, on my rig it hovers around 6% when nothing is running. Running the latest version 24.1 whatever… How do I revert back to earlier version? Might try that just because tinkering :) No AV, just Win Defender.