I managed to display those vines in-game, here are some nice screenshots of those new blocks that provide light as well as sustenance. The previous in-game shot I shared was tinted and using the regular vine model. As it turns out the original vanilla model for such blocks is supposed to be a hanging “cross” model like weeping vines.
Here are the “unlit” variants in a cave:
When lit, shaders such as Kappa that can rely on SSPT will give off slight emission on the surroundings. The emissive value is quite low, I didn’t want the berries to look like mini supernovae.