Can someone explain this matching logic?

[JuiceWSA]

@OttoKerner

Unfortunately, this is contrary what should happen if the previous file name caused a mismatch. Hence the need for the Dance, to clear that hash from the database.

…and in 40 years Plex has been unable to invent a better ‘mouse trap’.

Mandatory Reading for the Informed Plex User:

The Plex Dance ™

The purpose of this is to remove all cached metadata and xml data for an item that Plex usually keeps. This helps when you want to “start from scratch” for particular item move all files for the media item out of the directory your Library is looking at, so Plex will not “see” it anymore scan the library library (to detect changes) empty trash clean bundles (in menu next to server name, when accessed under ‘More’) double check naming schema and move files back scan the library Support articl…

There is no question. One day (perhaps soon) you will need to Dance.