Hi there!
There are some topics on this.
(228 votes):
https://forums.flightsimulator.com/t/water-image-quality-has-degraded-since-1st-release/301380
Or a search on “water” in Bugs & Issues:
Search results for ‘water category:200’ - Microsoft Flight Simulator Forums
The forum uses votes to bring issues up. When a duplicate topic is created, it splits those votes and we can not move/merge votes between topics. Could you have a look at any of the existing topics that has the same issue you describe and let me know?
Thank you!