World update warning says snapshot in 1.13

When trying to load an old world in 1.13, both the warning message (Don't forget to backup this world before you load in in this snapshot) when hovering over the world and the second warning when trying to open the world (This world was last played in.... Backup and load/I know what I'm doing/Cancel) both say "snapshot" instead of "update", "release" or something similar.