The affected blocks are the oak log (and top part), the oak sign, and the equivalent blocks in dark oak flavor.
I gave it a better oak texture I already put to use in the Realaccurate texture pack, and I wanted to let Vanillaccurate benefit a bit from the experience gathered with Realaccurate.
Here are some screenshots using Kappa v3.0 E9 shader. I did those screenshots with version 1.14.4 because entites have issues with later versions and I couldn’t have shown you signs with their intended design.
oak and dark oak :
Signs :
HardTop Vanillaccurate 