Subsystem format in History and Playlists doesn't work in v1.20.0

For instance if you played GB games in Super Game Boy, or other subsystems before, the following lines contained in content_history.lpl or custom playlists:

{
  "path": "E:\\Nintendo - Super Game Boy\\Donkey Kong (World) (Rev 1) (SGB Enhanced).gb",
  "label": "",
  "core_path": "C:\\Users\\D\\AppData\\Roaming\\RetroArch\\cores\\bsnes_libretro.dll",
  "core_name": "Nintendo - SNES / SFC (bsnes)",
  "crc32": "",
  "db_name": "",
  "subsystem_ident": "sgb",
  "subsystem_name": "Super Game Boy",
  "subsystem_roms": [
    "E:\\Nintendo - Super Game Boy\\Donkey Kong (World) (Rev 1) (SGB Enhanced).gb",
    "E:\\Nintendo - Super Game Boy\\Super Game Boy BIOS\\Super Game Boy (World) (Rev 2).sfc"
  ]
}

Then history and/or playlist entries get messed up, “No Playlist Entries Available” in RA 1.20.0. Is this a bug? Works fine before 1.19.1.