Haven't seen many occurrences of this issue, and tried to find another report in search, if there is a match to this direct me to it.

I was trying to clean up my shulkers a little bit, and broke them went to place them down and the first shulker I broke went missing, I looked for it in the dirt, and checked my inventory and it was not there.

I don't think this is the first time this has happened to me I have broke shulkers prior to the last update that contained gear several enchanted apples and all of my armor trim templates I've found, along with stacks of gold, iron, diamond, and emerald blocks, and spent hours looking in every available chest I have in my area, and never found them.