People not sitting in a modded chair?

Modding
1

Im probably missing something:
if i copy a chair, rename and change its appearance, it comes into the game just as expected…but no one will sit in it.

is there a “these items are suitable for sitting and eating in”-file that needs a mixin?

2

found the problem
had accidentally turned

“entity_data”: {
“stonehearth:chair”: {},

into “entity_data”: {
“stonehearth:armchair”: {},