Zabbix Agent/Agent2 prints item keys and retrieves values when using '-p' switch

When using zabbix_agentd or zabbix_agent2 with the '-p' switch to 'print' known items it actually prints the item and gathers its value (as per the '-t' switch).

What I would expect is just a list of agent item keys to be produced and not the actual values.

If I wanted to get the item and value I would use the '-t' switch with no parameter for all items and a parameter if I wanted a specific item.

By returning the agent item and value with the '-p' it takes for ever to run and there for cant be used as Zabbix item to contain a list of agent keys for the agent as there is a timeout of 30 seconds.

I was looking to do some monitoring for missing custom keys and/or additional 'custom' keys that have been added that are not standard for our environment.