If an autocrafting (With AE2) operation requires more than a stack from a single black hole unit, you cant initiate the autocrafting because AE2 will try to extract everything it needs, but if it's more than 64 it's not available because the units "only gives access" to 64 items at a time.

I can test more if needed.

Minecraft Version: 1.12.2
AE2 Version: rv5-stable-1
Forge Version: 14.23.0.2531
Industrial Foregoing: 1.5.5-92
TeslaCoreLib Version: 1.0.11

Also reported to AE2, but they directed me to you. I hope there is a possible work-around.

AppliedEnergistics/Applied-Energistics-2#3223

Awesome, thanks!