Some Sega CD redump.org images are not recognized

Is there an existing issue for this?

• This is a bug in RetroArch frontend
• I have searched the existing issues

Description

RetroArch 1.21.0 doesn't recognize some redump.org Sega CD images. For example:

• Bloodshot (Europe) (En,Fr,De,Es)
• Road Rash (USA)

I can see that serial numbers are matching after normalization:

$ file Bloodshot\ (Europe)\ (En,Fr,De,Es)\ (Track\ 01).bin
Bloodshot (Europe) (En,Fr,De,Es) (Track 01).bin: Sega Mega CD disc image: "BLOODSHOT (C) 19" (GM T-88045 -50, (C)T-88 1995.MAR), 2352-byte sectors

$ file Road\ Rash\ (USA)\ (Track\ 1).bin
Road Rash (USA) (Track 1).bin: Sega Mega CD disc image: "ROAD RASH " (GM T-50085 , (C)EA 1995.MAR ), 2352-byte sectors

$ for F in *.bin; do SN=$(head -c 414 "$F" | tail -c 11); echo "${F}: '${SN}'"; done
Bloodshot (Europe) (En,Fr,De,Es) (Track 01).bin: 'T-88045 -50'
Road Rash (USA) (Track 1).bin: 'T-50085 '

The database lists both T-88045-50 and T-50085, so both should be recognized, if I understood the source code correctly. Maybe I'm missing something. Anyway, these are verified redump.org images, and should be recognized by RetroArch.

Expected behavior

No response

Steps to reproduce the bug

1. Get the redump.org Bloodshot and Road Rash dumps
2. Import Content -> point to a directory where dumps are stored
3. Confirm that importing didn't work - games were not added to Mega-CD - Sega CD playlist

Version/Commit

1.21.0 (Git 54af661d95)

Bisect Results

No response

Present in the nightly version

I don't know

Platform & operating system

Linux amd64 (SteamOS Holo)

Affected Cores

No response

Environment information

No response

Relevant log output

Reproduce the issue in RetroArch 1.21.0 by importing the redump.org Bloodshot and Road Rash images into the Mega-CD - Sega CD playlist. Start by tracing the content-import recognition path and comparing its serial normalization with the database entries T-88045-50 and T-50085. Done means both verified images are recognized and added to the playlist.