OpenJO level transition glitch

[marigi64]

On jk2 SP at the end of a level the game will take a screenshot. For some reason it won't display the screenshot correctly. This happens right before the level stats appear.

[Calinou]

This is something I've seen on numerous id Tech 3-based games, but I don't know why it happens.

[SomaZ]

Looks like channel count mismatch between readback and image save function. Like it only reads back RGB buffer, but the screenshot function expects RGBA instead.

[Razish]

👍 for this issue, experienced with latest build of OpenJO (Linux/Debian x86_64, AMD Radeon RX 6600XT). It only appears for a split second but is noticeable.
Aiming to look into this in the next week of JK2SP bug bashing.

Seems to be reproducible messing around with quicksaves and vid_restart, not just level transitions.