What should happen

A shulker that is summoned using a spawn event to change its colour should spawn with its shell coloured as the spawn event specified. For example, a shulker that is summoned using the command ‘/summon shulker ~ ~ ~ turn_pink should spawn as a shulker with a pink shell.

What actually happens

Any shulker summoned with a spawn event to change its colour turns black instead of the colour specified by the spawn event and takes the name of the colour that is supposed to be. For example, a shulker summoned using the command ‘/summon shulker ~ ~ ~ turn_brown’ will span as a black shulker with the name brown.

The anomaly

A shulker summoned using the command ‘/summon shulker ~ ~ ~ turn_black’ spawns as a black shulker with no name, as it is supposed to.

Notes

I haven’t tested all of the colours.

I have footage that I will upload as soon as possible.

A similar thing happens with the drowned.