If you create a .properties file to add connected texture for two-block-high aquatic plants,there will be a rendering issue:

I discovered this issue when I was playing Biome's O plenty with xali's Enhanced Vanilla resourcepack.The BOP water grass uses the model of vanilla grass as its model and this resourcepack adds connected texture for vanilla grass,therefore the issue happened.

It's not an unique issue,It can happen to any high plant:
xali's+Enhanced+Vanilla+v1.11.1(modded version).zip
In this test resourcepack I replaced the models of BOP reed and Farmer's Delight wild race with rose and kept connected texture of rose,the issue still exists

(Resourcepack off)

(Resourcepack on)

This is the appearance of the test resourcepack presented by continuity

For more details:xalixilax/xali-s-Enhanced-Vanilla-16x#10

I found out that shaders being ON fix my issue with plants
edit: also had a strange issue with connectedness having weird textures, was fixed with shaders enabled