I tried Microsoft’s Process Monitor without much luck. It didn’t mention any new process that wrote to any of those files, but, Hugo still detected some changes. However, I was filtering the events that included only ‘Write’ access because there were a lot of events otherwise that were increasing by every few milliseconds. Probably, one of them has an answer, but, it’s too difficult to read the list.
Sadly, even after a lot of trials and errors, the exact cause is still undetermined. If at all someone ends up with more information to narrow this down, that’d be great.