I've been meaning to start a similar thread, but didn't get round to it!
My local station, Pevensey Bay, received more services than usual for the majority of lockdown.
When the first restrictions came in and the service was reduced severely to an "enhanced Sunday service", Mon-Fri stops were put in on the hourly London Victoria - Ore service at similar times to the usual services (4 Westbound and 5 Eastbound). However, in addition, an early morning Brighton - Hastings stopper was added, calling everywhere apart from London Road. I assumed this could have been for route knowledge?
During the second lockdown, Pevensey Bay received an even greater gift - Saturday services! The stops were back to their normal times, but changed to Mon-Sat inclusive. I expect it was simpler for staffing rotas to keep the same timetable.
Now there's only 4 trains each way Mon-Fri, the 16.56 has been culled.