Not OP, but I went to go look and found the Minecraft one (which was one of the six apps above the fold in "Popular") leads to that:

https://flathub.org/apps/details/io.mrarm.mcpelauncher

``` App Not Found

No app with the ID io.mrarm.mcpelauncher was found on Flathub. Try searching for the app using the search bar above. ```