How to prevent metadata from bad TVDB matching

[TheDreadPirate]

1. Not that I am aware of.
2. That setting would use the embedded title instead of the file name when constructing the query for TMDB/TVDB, etc. It does not configure Jellyfin to only use the embedded metadata.
3. If you set TMDB as the primary, any TVDB mismatch SHOULDN'T be a problem. However, if your metadata provider order of precedence is not consistent through each metadata category, that could cause problems if TMDB and TVDB match on different shows.

If you need only local metadata for a show, you have to disable all providers in the library for each category, scan in the show, lock the metadata for the show, then re-enable the online providers for future shows.

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theguymadmax also has a good suggestion. Using the ID in the folder name should correctly map the show, even between providers. Assuming it exists in both locations.