Thank you for reporting this. I traced a problem in Now Playing’s text formatting: it treats backslashes in song titles as escape characters. That would turn C:\Projects\CJOST\BEATDEATH into C:ProjectsCJOSTBEATDEATH, even though Plex supplies the correct title.
I found your 15.1.0 logs. Could you confirm that this is the text you see, and whether the affected device is your Samsung phone or Android TV? The upload identifies an SM-S906U1, while the report selects Android TV.