Are you sure you want to report this?
Some effects already go negative (in JE atleast) when set to a too high value:
for example: /effect @p jump_boost 10 [anything above 127] Will give you a negative jump boost, first it appears you j...
The server oparators need to take care of that, it is a server issue and not one for minecraft.
I think shulker boxes are like backpacks.
Maybe dyeing the entire bed will change the color of the blanket.