command execution with nbt is broken

I'm trying to make something like a stone age workbench from sevtech ages, but I ran into mcreator limitations. To make items lying on the table I had to use block_display. But mcreator doesn't let me spawn block_display with a tag. No matter what I do. I even asked nero-net for help. I got an answer like "escape the quotes" which naturally didn't help. Maybe someone has encountered this?