Certain keys do not work.

To check the problem we have set up a new fresh installation. 
In the screenshots you can see that the items were completely discovered. Since the values "Interface Speed" are read out after 5 minutes, it can be seen that the other values are missing without error message.

Steps to reproduce:

See screenshot...

Result:
See screenshot...

Expected:
valid data

affected Keys:

zabbix[wcache,values]  (in our productive environment)

net.if.in[ens160]  (in our productive environment)

net.if.in["ens160"] (in our test environment)