It’s almost a game EASA plays as a sort of punishment to the CAA and the UK. The UK CAA accepts EASA licenses still, but other way around they don’t.
No authority seems to understand why EASA doesn’t just recognize everything that happened before 1 January 2021. Instead they just make everything invalid.
Victims are all the crew in this case. I also hope they sort it out as it makes no sense at all and is bad for all involved.