The bug
Normally, when you try to open an old world an orange exclamation mark is shown in the world selection and a warning screen is shown recommending to make a backup.
However, this is not the case when opening worlds, which have been created before version information was stored in the world files and are in the Region format (< 1.2.1 ?), in a snapshot version (this appears to work correctly when opening them in the release 1.15.2 though).
Reproduction steps
Create a world for example in Minecraft 1.0, or download
Try to open the world in the latest snapshot
❌ No warning screen is shown (also the game might crash, see MC-180372)
Related issues
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