Steps to reproduce:

1. Use linux agent active template
2. Target vmhost machine with vnet* interfaces

Result:
In zabbix_server.log:

item "HOSTNAME:vfs.file.contents["/sys/class/net/vnet8/operstate"]" became not supported: Value "Problem parsing interface operstate in JS" of type "string" is not suitable for value type "Numeric (unsigned)"

Expected:
No error message

On target machine:

cat /sys/class/net/*/operstate
up
up
unknown
up
up
up
up
up
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown