A problem that has been occurring for a long time in minecraft, grass floating over lakes. I will show a print that I took from the screen of one of the many lakes that appear with floating grasses, I don't know if there is any other related file but there it is. The version I'm playing is 21w18a and I don't know if the two new versions fixed the error.
If not, I hope you fix that old mistake.
Thank you for your report!
We're tracking this issue in MC-610, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Fixed. Please check the Fix Version/s field in that ticket to see in which version this behavior was or will be fixed.
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