Not really a "bug" per say but I don't see a reason why it shouldn't work.
Issue description:
Screen does not allow extraction of modules to ME storage bus
Steps to reproduce:
attach storage bus to a screen, try to use a terminal to pull modules out.
Versions:

• Minecraft: 1.12
• Forge: 2624
• McJtyLib:2.6.5
• RFTools:7.30
• RFToolsControl:1.8.0

So it looks like items can go in, but can't come back out, and when they do go in, the screen doesn't update until you open its GUI. Does this match what you're seeing?

Indeed