This is something that has highly annoyed me for years. The fact that the tile of the enchanted trees has a different base texture than the enchanted grass, resulting in a very ugly mismatch.
In Wurm Unlimited, I went into the files and sure enough, trees use a different texture. I would like to humbly suggest that either the enchantedgrass.dds texture be copied into the "enchantedforest.dds" texture, or even better, have the code assign the enchantedgrass texture to be used as a base for the enchanted trees.
Apparently I'm not the only one who feels like this, @Hordernposted about this in 2015 and even made a poll. Here are the results of the poll, which speaks for itself: