Seems like Funwayguy closed the previous thread about this issue without claiming it was fixed or explaining why people were mistaken about it being broken.

To reproduce:

• Download MultiMC
• Create a fresh Minecraft 1.12.2 modpack instance using MultiMC
• Launch the instance once to generate files and folders.
• Using MultiMC, install whatever version of Forge it puts a star next to by default. (looks like in my case, this was 14.23.5.2768)
• Download BetterQuesting-3.5.314.jar , StandardExpansion-3.4.169.jar , and questbook-3.1.1-1.12.jar from Curse and drop into the new mod's .minecraft/mods/ folder.
• Relaunch the modpack and Create a New World with Allow Cheats: On
• Type the command "/bq_admin edit" without the quotes into chat
• Press ` key (AKA the ~ key)
• Create a new Quest Line, Quest, and Retrieval Task (1 block of dirt.)
• Type /gamemode 1
• put down a new Object Submission Station and attach a Hopper to it.
• Type /gamemode 0
• Break a dirt block
• Right-click the Hopper
• Place dirt block into Hopper.
  Game crashes on next block tick.

Closing this due to duplicate #660

I remember editing this twice. Not sure how both of them got uploaded though. Weird.