I have the 1.16.5 version of the mod installed in a modpack of my own, when using the Arcane tablet it doesn't have the functionality it does in version 1.12.2 also the EMC links don't have their gui's either, hopefully someone has the answers to these questions, I really like the mod but it doesn't seem to be ported to the new version properly and no update in 6 months or so.

Those are WIP over here and this mod seems to be abandoned, I've made a fork: https://github.com/DonovanDMC/ProjectExpansion it doesn't have the arcane tablet as it is over here, but it does have a fully functioning emc link, with emc import, and item import & export (1.16 & 1.15 currently)

In 1.12.2 it doesn't work either