As someone who joined earlier in the year, the first 1~2 weeks where we had nothing on, (no orientation/training/project), we were told to charge it as meeting time.

So far, regardless of actual hours, we've just been told to put everything at 8 hours. Doesn't matter if you only had 1 task did it in 2~3 hours and continued to slack at home or had to go down to the office from morning to late evening.

Pay has been the same apart from a random one-time bonus which someone found could be linked to work from home reibursement setup. No one I've known has had to charge lesser hours nor suffered a pay decrease.