Hello, we appreciate you raising but we believe this to be an isolated example, especially due to it being far in the future. This sort of thing, will happen in certain scenarios.
For example, all Premier League final round games have to be at the same time on the same day, which will be set at the start of the season, so it won't just reschedule one fixture after the final league round.
This was probably a rare year where multiple things have conspired for you and it had to force a fixture into that gap due to not being able to put it anywhere else.
If you do spot this again in your save, please do alert us, thank you.