When you create a new world, go to More world options, the button for world type has 2 colons at the end instead of 1. This only happens when using a resource pack from older snapshots. The same resource pack does not have this on older versions.
MC-215953
Typo on World Type
Resolved
Invalid
0
Update the resource pack
(You really should not be including every single translation in
en_us, only the ones you made changes to)