Issue description:

Server is crashing when telling a export buss (in craft only mode) to craft ingots and export into a 2*2 drawer that also have external storage buss on it

i have other export busses with crafting upgrade on them and they work just fine

What happens:

once export buss is told what to export the server stops

What you expected to happen:

to have ingots premade for faster crafting later on when those materials are needed for another crafting

Steps to reproduce:

1. export buss (in crafting only mode) + storage buss (this have -1 priority on it) on a 2*2 drawer

2. drawer is preconfiged with ingots

3. tell export buss what materials to craft and put into the drawer
   ...

Version (make sure you are on the latest version before reporting):

• Minecraft: 1,12,2

• Forge: 14,23,0,2431

• Refined Storage: 1,5,23

Does this issue occur on a server? [yes/no] YES

If a (crash)log is relevant for this issue, link it here:

https://pastebin.com/hqXejpNA

[pastebin/gist/etc link here]

That is a watchdog crash, not much I can do with that.

(Craft only mode has been removed in the next version, so your problem will be fixed then.)