Exclusions don't matter. It is the disk sector modification that can cause problems. Some AV have problems with it. I don't think it is Avast.Currently no probs. 2-3 times Probs, I meant my experience with Rollback RX 10.4 & 10.5 latest in the recent few months.
Currently I am running latest Rollback Pro 10.5
Avast Internet Security
Windows 10 64 Pro
AIS was already installed. I had disabled AIS protection to install Rollback. I have excluded AIS files/folder/processes under Avast exclusion - File Paths, CyberCapture & Hardened Mode.
Some AV do not like to be installed into snapshot. Avast can be installed into snapshot. Others can be, but scans will cause BSOD.
It is hard to say what happened on your system.