Looks like an NFS config error:
Code
2019-12-19 17:21:53.384 T:1554932608 ERROR: Open - Unhandled exception
2019-12-19 17:21:53.384 T:1554932608 ERROR: Open - Error opening nfs://192.168.42.40/volume1/Video/The Circle/the_circle.iso
2019-12-19 17:21:53.384 T:1554932608 DEBUG: CNFSFile::Close closing file volume1/Video/The Circle/the_circle.iso
2019-12-19 17:21:53.384 T:1554932608 ERROR: Error opening image file or Error on dvdnav_open_stream
2019-12-19 17:21:53.384 T:1554932608 ERROR: CVideoPlayer::OpenInputStream - error opening [nfs://192.168.42.40/volume1/Video/The Circle/the_circle.iso]
Compare the NFS config of the RPi4B and your lower device versions.
The Blue-ray ISO's maybe have different Linux permissions, so they work.