I've tried a number of series now and they have all failed after adding the folder (in the 2nd root folder) to the list. This is on MC v3.7.7.3 (no updates available)
The logged one (see output below) was for "NCIS, New York (2026)", others I've tried include "Neagley" & "Neagley (2026)"
This bug is relatively new (maybe current release).
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Found Folders:
M:\TvShows\NCIS, New York (2026)
Initializing TVDb...Searching for series: NCIS, New York (2026)
Unable to scrape body with refs "M:\TvShows\NCIS, New York (2026)
TVDB may not be available or Series Title is invalid
Saving tvshow.nfo -O
TVDb is no longer available to MC since they shut down api v1 and v2 switch the series to scrape from TMDb.
Actually if you scrape from tmdb first then scrape using tvdb it will scrape the show so its not fully unavailble just the normal tvdb scraper is. SO as long as it has the tvdb id it will scrape it just wont scrape by show name