I have issues with this as well.
I have an LG C5.
Set my Vero V GUI at 1080p 59..hz.
Adjust refresh rate at start/stop (delay of 3sec).
But why video at 1080p 23.98hz does not switch framerate and plays at the gui hz (60hz as per TV info).
Playing a 4k at 23.98hz (24p) will switch.
To fix this I had to enable only the 24p modes on the whitelist. BUT there is no 1080p 24hz/23.98hz whitelist option.
Now when I play 1080p 24p content, it switches to 4k 24p mode.
Why is there no 1080p 24hz option in whitelist?