Issue was discovered during test scenario execution of ZBXNEXT-7951

Steps to reproduce:

1. Create three templates(A,B,C);
2. Link these templates (A>B and B>C);
3. Add each template unique item and template group;
4. Create host1 with unique host group;
5. Link template C to host1;
6. Export host1;
7. Import this exported host into environment, which has host1 and templates(A,B,C linked in the same order A>B and B>C) with items, using different item and host/template group names.
8. Observe host1 and linked template C, check the rest templates which are linked to template C; 

Result:
Only host group for host1 was updated, and neither of templates were updated.
Expected:
Full depth of linked template information should be updated.