Inconsistency in assignment of host interface upon inheritance of items for which a host interface is optional

Steps to reproduce:

1. Create a template T1 with 5 items of types Http agent, Simple check, SSH, TELNET, External
2. Create a host with at least one host interface and link a template T1 to it.
3. Check the host interface field for each of the inherited items on the host. - all of the items have a None host interface.
4. Create the LLD rule on the host, and create a host prototype with at least one host interface (iherited or custom). Link a template T1 to host prototype.
5. Execute the LLD rule.
6. Check the host interface field for each of the inherited items on the discovered host.

Result:

As the result of the third step all of the items have a None host interface assigned.

As the result of the sixth step the HTTP agent item have a None host interface assigned, but the items of types Simple check, SSH, TELNET, External have some host interface assigned.

Expected:
The assignment of the host interfaces to items works consistently for API and Server.