Hi,

As things stand, digit items get inserted as rocket payload rather than rocket part crafting ingredient if there is no payload. I tried to block digit insertion when there is no useful cargo, but I could not figure out a way that did not loose the race condition when the previous rocket launches. A work-around is to extract any digit from the silo until there is a cargo, but that's tedious. It also prevents the crafting of rocket parts until the rocket payload is ready.

Is it possible to ban digits as cargo just like the base game bans blue circuits, LDS's and rocket fuel?

The items are set as "not-sendable" to orbit by default, so I'm really not sure how they would be ending up as a payload... My best guess as to what is happening is that when the recipe switches, the inserter gets confused as to where its dropping a number off, but I really just do not understand what's going on here, and I couldn't figure out how to reproduce it.

I'll keep thinking on this, though. Thanks for bringing it up.

I've noticed something potentially related. If two inserters are putting in letters at the same time to a decompiler, the second letter will be placed in the output slots. I'm guessing it's some kind of failsafe, as currently the 26 output slots can be added to, even by the player.