I'm running LibreElec 9.2.6 on a Pi 4, and some resolutions are missing from the whitelist. In particular, although there is a 3840x2160p at 25Hz, there are no other resolutions available at 25Hz - it's not listed for 1080p or 720p. This makes watching PAL material a pain.
Additionally, 480p resolutions are listed, but there are no 576p resolutions.
These resolutions are listed as supported at Video options in config.txt - Raspberry Pi Documentation so they should be possible.
I tried forcing hdmi_group=1 in config.txt but it didn't make any difference.
Is this a known issue? If not I can make a log file.