Water appears to be in boat which is a visual glitch considering water is not inside boats with ray tracing turned off.

Here I attach a few images to make it crystal clear:
Ray tracing off:

ray tracing on:

and also Obviously Removing water texture does not remove it from boat, it just makes water transparent but you still see water reflection & caustics in boats.

Edit: 
Bug is listed in known issues.
https://help.minecraft.net/hc/en-us/articles/360042255511-Minecraft-with-Ray-Tracing-Known-Issues-List