"Force max resolution" is not always the max resolution

[DatAres37]

YTAF Version

0.5.3

webOS Version

10.2.2-63

Firmware Version

33.23.05

OTAID

HE_DTV_W23O_AFABATAA

SoC

o22n

Model

OLED65C39LC

Description

Setting "Force max resolution video playback" seems to not always provide the max resolution. I've only noticed this on 4K videos yet, where I had to manually select 4K in the video settings.

Setting:

Result (not specific to HDR):

Priority

Barely noticeable, but still not nice.