Would this be what is affecting the Silent and NoAI tags I'm adding to spawn eggs?
No, I don't think so. I just tested
/give @p minecraft:spawn_egg 1 0 {EntityTag:{id:zombie,NoAI:1b,Silent:1b}}
(albeit in snapshot 17w17b) and it worked just fine. Did you manage to get it solved?
Opening the world in the file bug-world.zip that I attached and loading the structure blocks in the order displayed on the signs causes this bug. My crash file: crash-2018-06-11_18.58.57-client.txt