Looking through water flowing from near the top of a hill in a frozen ocean biome leaves greenish smearing as you rotate the camera. It felt like a TAA type artifact so I made sure to select Bilinear Upscaling Mode (instead of TAAU) and set Resolution to Native to do what I could to eliminate TAA. This video capture is with Bilinear and Native.
This might be related to MCPE-204062
Looks like this might be the same as MCPE-199260