I just noticed that if you try and create a Smart Filter in the Color page for clips with a Video Codec containing "RED" (as is displayed for RED files in the Video Codec field of the Media Pool), that it won't display those clips when the Smart Filter is active.
However, if you search for "R3D" as the video codec, the clips appear as expected. But "R3D" is
not the video codec!
Searching for "R3D" as the video codec:
Searching for "RED" as the video codec (no clips appear):
The Media Pool reports the codec for RED files as "RED", so I believe this to be a bug.
This is happening in Resolve 16.2.6 on macOS 10.14.6
Resolve Studio 18.0.2 / Decklink Mini Monitor / 14" 2021 Macbook Pro Max (macOS 12.5.1, M1 Max) / 32GB RAM