On Structure Instance Generated not working properly

When making a structure there's an event trigger for when the structure is generated;

Since update ticks don't happen on blocks that were just generated, I used a procedure to update certain blocks in my structure to give it some variation, however I found that the procedure was only happening to the first structure that was generated throughout my world. 

Am I doing something wrong?

EDIT:

I found a semi-solution:

https://mcreator.net/forum/63924/how-update-structures-spawn