Steps to reproduce:

1. Create the "Group prototypes" with macros in the "Host prototypes" of the LLD. Such groups with the same name should not exist.
2. When you started LLD on first object the necessary groups were created and assigned to the discovered hosts.
3. But subsequent executions of LLD on other objects end with an error:
   "Cannot create group: group with the same name "..." already exists."

Host prototypes:

First created object:

Error on other: