When you try to backup a world, or it tells you that you are on a different version it calls 1.13 a snapshot.
[media]<<<see, like this image
VV also this, sorry if this bug report is formated weird =P
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When opening a new 1.13 world in an NBT editor, it says
version:1.13
snapshot:0

@hamarb123 Minecraft 1.13: the Snapshot Release Update
Or
Minecraft 1.13: Schrödinger's Update

Major changes introduced to the game necessitated this prompt. More precisely I'll call this "Major conversion required to use this world"

Please reopen it, Still not fixed in 1.13.1

Looks fixed to me; I'm not sure where you're seeing this.
There's a new ticket about the tooltip being incorrect: MC-149111
It is both a release, and a snapshot