Steps to reproduce:

1. Create two hosts
2. Create one item per each host with same name, but different item key, for example see:
3. Populate item data
4. Create on dashboard widget "Top Hosts", add two hosts with item we created in step 2, for example see:
5. 

Result:
Only one host shown in Top Hosts widget
Expected:
Both hosts visible in widget

While it maybe sound similar to ZBXNEXT-7535 , it is expected (at least from documentation and web UI of Zabbix) that items with the same name should be shown regardless of item key