We do not control nor limit fireworks on our servers. If this is an issue it's an issue with the game and not us. I do see several servers reporting the same issue.
I've forwarded this over to the devs.
I've sent this off to FP. It seems related to the socket bug (i.e parented entities are destroyed if something is removed near it)
Reproduction: Place a table and then place an entity on it, a jack'o'latern then place another deployable next to the table. Destroying the deployable will also destroy the lanterns.
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