On Bedrock Preview 1.21.80.26 when vibrant visuals are activated, I found a waterfall infront of an open air pocket. The waterfall appears completely white when there are no blocks behind it.
MCPE-199257
Vibrant Visuals: Waterfall appears white when in front of an open air pocket.
Open
2
(Unassigned)
1373877
Plausible
PlayStation
PS5
vibrant-visuals
1.21.80.28 Preview
Retrieved
Your recording looks odd hope mojang or microsoft fix this before I try out the new visuals.