If an enderman is given any tall flowers with commands, the flower will break immediately when placed.

What I expected to happen was...:
The tall flower being places as a player would place it, placing two blocks.

What actually happened was...:
No flower was placed.

Reproduction steps:

1. Summon an enderman with

   summon enderman ~ ~ ~ {carriedBlockState:{Name:"minecraft:sunflower"}}

1.  Spectate it
2. Wait until it places the sunflower
3. See that while the sunflower is removed from his hands, it doesn't get placed anywhere in the world

Code analysis

EnderMan.EndermanLeaveBlockGoal.tick runs

level.setBlock(blockPos, blockState3, 3);
this.enderman.setCarriedBlock(null);

without running Block.setPlacedBy, which causes the block to not update correctly.

It can be fixed by adding

this.enderman.getCarriedBlock().getBlock().setPlacedBy(level, blockPos, this.enderman.getCarriedBlock(), this.enderman, this.enderman.getCarriedBlock().getBlock().asItem());

before doing

this.enderman.setCarriedBlock(null);