DaVinci Resolve 21 Randomly Switching Cameras During Render

Heyho!

Since DaVinci Resolve 21, I've been encountering a problem when rendering 4K/large projects. Sometimes there are weird flickers in the rendered video, like in this video https://f.io/fs5pJb2T at 29:24:20. At that point, you can see that it messes with the footage's saturation and even switches to a different camera on its own.

There doesn't seem to be any problem with the footage itself. At least, I've never encountered this issue when editing the exact same footage in Premiere Pro. Also, when playing the video back in DaVinci Resolve, I don't see any of these flickers.

I've edited this video without using a multicam clip, meaning I manually layered the camera files on top of each other. My temporary solution was to delete all the video clips below the camera I wanted to show. That way, it couldn't switch to another clip on its own because there were no other clips underneath. This has solved the problem in the past.

However, the last video I edited for this client was made using a multicam clip, and now I'm experiencing the exact same issue again: during rendering, it randomly switches to another camera and applies weird color/filter changes. Everything looks completely fine in the timeline and during playback in DaVinci Resolve.

Does anyone know what I could change to fix this?