On my Emby instance, "remote" titles of some items (movies) are disappearing and being replaced with the title in the file metadata.
This seem to occur more often on items in collections and items I have multiple instances of (4K & 1080p, normal and extended versions, etc) where only one of the "same" items keeps its title.
I understand this doesn't help pinpointing the actual issue a lot, but just wanted to let you know.
To work around this, I just use the update metadata option on these items.
By doing this I found out that selecting multiple items and using update metadata on the selection does not do anything.
Using Emby v188.8.131.52, same in Web App in Chrome and in Emby Theater v1.1.306.0