I cannot say for sure that this happens but I have been recently been surprised to see version updates when I have not manually initiated them. I also suspect that this has happened with a Windows 10 system I support but only occasionally visit. Its user waits for me to to perform the Avast updates because of system disruption following an attempted update from 21.5 to 21.8 last year. I recemtly visited her and was surprised to see Avast 21.5 had apparently automatically updated to Avast 22.3 on 4 April 2022, WITHOUT PROBLEMS!!!
Avast seems to be full of surprises.