Specific colormap changes causes grass block to display "snowy" texture on the side. Provided example is about regular color map and its issue can be observer on the jungle biome, however, we can assume that it can affect other biomes in different configurations. Issue also affect other colormaps used by grass blocks in their respective biomes.
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It's only related. MCPE-73587 seems to affect grass blocks on a chunk on any biome without the usage of resource packs.
I updated the pack to use 1.16.220 for the min_engine_version, and the bug still occurs in jungles. The only difference between the grass.png file in the pack and the vanilla grass.png that I can see is that the colors are deeper in the pack.
I do wonder if the problem has to do with layers in the image file, like with tamed wolves. See https://bugs.mojang.com/browse/MCPE-48232?focusedCommentId=608030&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-608030
I think this is a duplicate MCPE-73587.