What i did / Steps to reproduce

I think this bug was introduced in version 5.10.

You can test it live here: https://mc.woody.pizza/#sindelswelt:-13489:60:1938:36:2:0.99:0:0:perspective

The bug does not appear on the test server, which is version 5.9.

https://bluecolored.de/bluemap/#overworld:-629:62:-5201:26:2.96:0.71:0:0:perspective

Expected result

Lily Pads should have the correct color.

Actual result

The lily pads are gray.

Context

BlueMap Version:
bluemap-5.10-paper

Paper Version:
paper-1.21.8-22