MC-117570] No recipe for colored shulker boxes in recipe book - Jira
I made a data pack that allows you to craft Shulker shells if you don't want to make your world or server too big! (Download in comments) : r/Minecraft
How to craft black shulker box in Minecraft | Minecraft Wiki
MC-107444] Shulker box dyed, can't be crafted - Jira