The old /give Sikatsu spawn_egg:50 1 or /give Sikatsu 383:50 1 is not working anymore.
The output is a default spawn_egg that doesn't do anything.

Minecraft wiki says:

From 1.11, the command should be /give <playername> spawn_egg 1 0 {EntityTag:{id:minecraft:wither_skeleton}}. The minecraft: should be added properly.

This command seems to work for now, but gives staff a notification everytime the command runs:

/minecraft:give Sikatsu spawn_egg 1 0 {EntityTag:{id:minecraft:wither_skeleton}}

I use the command so players can buy spawn eggs, or win them from vote crates.

I think this has been an issue for a long time for certain items, and I believe fixing this would require a lot of changes to how items are handled.

Really? I never had issues with it on any of the previous minecraft versions..

I'm also having this issue, there is currently no way to sell eggs from sign shops. You just get a white spawn egg that does nothing :( I tried 383:x and spawn_egg:x where x = mob ID. Nothing else will fit on the sign, therefore we need the y:x method to work again! This would apply to spawners, too, I'm sure.

I'm trying to sell LLama eggs, btw: 103

Not this specific issue, but 1.10 attributes have never been supported by EssentialsX and I believe there are other similar issues elsewhere.

While attributes didn't, /give Sikatsu spawn_egg:50 1 always worked

This has been fixed in 5fda1d0. You can grab the fix from build 451 on the CI server.

Sorry for any inconvenience this may have caused.

Thanks! I seem to be able to spawn llama eggs, but skeleton horses and zombie horses are missing?