When opening a 1.13-pre10 world in 1.13, I am told that I am on snapshot 1.13. However, when opening a NEW 1.13 world in an NBT editor, It shows snapshot 0, indicating that it is NOT a snapshot in a new world.
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This issue is NOT resolved. I find this a non-resolved issue and do not think that it should be marked as RESOLVED until it is fixed in Minecraft Java Edition.

It is a duplicate...
Duplicate of MC-133942