Reloading the save seems to fix the issue. I can recreate it if I load the save before the fixture was rearranged. Don't use a custom skin just a logo pack. The EFL cup final played out normally even when the schedule screen displayed it wrong and after the game it correctly displayed the fixture as well. The match displays correctly in the rearrangement email and in the calendar too. I'm uploading the save before the Fa cup 4th round if you want to have a look but otherwise its not a big issue.
Save name is "The Gaffa - Wrexham Pre fixture Rearranged.fm"