I drew a bended plywood form.
After that, I drew a block of foam, starting with a part copy of my plywood.
My protrusion of the foam is made with "Project sketch" with the option "Maintain associativity" ON.
After that I needed to change my plywood part, so the foam has to change automatically.
Apparently this happened, but with error:
You see all the lines are orange, so not good.
When I erase the "8 lookalike" symbols, the lines are blue again, but than the associativity is lost.
How to fix this best?
Now with parts (ST8)
No idea why the errors (kinda have to "be there" or see it in person) but the sketch appears to me like you could delete the includes and constrain it with point-on, concentric and equal.
I'm not quite sure either but it's happened to me a lot over the years. One trick I try is to delete the links as you did, but then turn around and undo the deletes. Sometimes that works.
Do you stand up to turn round or remain in your seat ?
Does one method work better than the other ?
I spin around a few times in my chair - enough to get dizzy and then try again.