I had purchase Minecraft Dungeons and the hero upgrade. I hadn't played it for a while, and when I tried to access it again, the latest version said it would now launch from the minecraft launcher.

However, when I open the minecraft launcher, it informed me I need to purchase the game. I checked on my mojang account, and the game is gone. I have the transaction and order IDs to prove I did buy the game. What is going on, how do I solve this?