vanilla resource folders starting with 1.21.70 contain a file called StarterSeeds.txt

Steps to reproduce

1. In Windows Explorer Navigate to C:\Program Files\WindowsApps\Microsoft.MinecraftUWP_1.21.9301.0_x64__8wekyb3d8bbwe\data\resource_packs\vanilla_1.21.90
   or C:\Program Files\WindowsApps\Microsoft.MinecraftUWP_1.21.9301.0_x64__8wekyb3d8bbwe\data\resource_packs\vanilla_1.21.80
   or C:\Program C:\Program Files\WindowsApps\Microsoft.MinecraftUWP_1.21.9301.0_x64__8wekyb3d8bbwe\data\resource_packs\vanilla_1.21.70

2. Look at the list of files and folders.

Expected results

The folders would contain only files that are used by the game.

Observed results

The folders contain StarterSeeds.txt, which contains a list of 40 integers, one on each line. Presumably these are world seeds.