So I am playing the modpack AlltheMods9 (on a server) and I wanted to set up an automated Cropfarm with Mystical Agriculture inside of Hyperboxes.
Now after a lot of time setting all of my hyperboxes up and doing my last trip through all of them i realized, that none of the seeds are growing anymore. After a little testing it turns out, if you give a blockupdate to one of those Crops, all connected seeds (due to other blockupdates next to them) break.
The only real way to bypass this behavior is by permanently chunkloading the chunk within the hyperbox, but only if it was loaded before leaving the hyperbox after having planetd the seeds