I have dealt with this issue multiple times but i got this issue again but for this i had no choice but send a issue. I am pretty sure the new configuration system (0.6.0+) is causing it. I have fixed this by downgrading to the old configuration system. However there's no version below 0.6.0 that is on 1.21.4.

EmoteCraft: Works but player head rotation doesn't apply to the camera's rotation

3D Skin Layers: Makes the entire mod unusable when enabled. The configuration menu's preview also breaks. 3D Skin Layer's Compatibility Mode doesn't change anything

NOTES: I have issues trying to use the new configuration system so i'm not sure if there's some property to fix it.

My Suggestion: Port Real Camera's last version before 0.6.0 to newer minecraft version's so this wouldn't happen and other people would have to use a older version of Real Camera so mods like EmoteCraft & 3D Skin Layers work fine.

I just found out that its not just rotation that Real Camera is not tracking when using EmoteCraft. Position on the X & Y axis also aren't tracked.

Only the Y axis gets tracked of the head's position. If i make a theory out of this. I am guessing that it only tracks the Y axis on position and 1-2 other axis on rotation and the emote i was playing had the head rotated on a axis that Real Camera wasen't tracking.

Maybe it should do that?