Using a disassembler and a card container made with a chest you can get a shulker box

What version of Minecraft are you running?

After investigation, it is found that this is a compatibility issue, and for unknown reasons, Shulkerbox will be added with chest's ore dictionary tag. This is not a problem of OC itself

This is my personal speculation, because the ModPack I am using has this modification. But no attempt was made to reproduce it

This is a difficult issue because it would be unreasonable to track what the card was made with and so it ends up being that the disassembler just spits out what the recipe consists of and shulker box just happens to be at the top of the list for items with the forge:chest tag. Maybe the tag needs to be more specific. I'm sure there is another mod that adds shulker boxes to that tag and maybe that should be changed. It would be an easier fix than changing the code of the disassembler. However, it could result in breaking changes for other mods. Though I imagine adding a filter to keep the disassembler from creating shulker boxes wouldn't be too hard. Worst case you use a shulker to make the container card and you lose it upon disassembly. I doubt anyone is using shulker boxes to make things that could use a chest instead.

What version of Minecraft are you running?