XPages: Rendered Vs Loaded

Today I observed runtime error in one of my XPage. I investigated later and found that the error is occuring on a custom control which should not be rendered in this scenario. I have several custom controls added on my XPage and display only one custom control based on some condition, so I have computed the rendered property.
Now the question is, if the custom control is not rendered then why it is generating error?
I further investigated properties of the custom control and found there is a property “loaded”.

Rendered: it controls the visibility of the control, i.e., if it is true then the markup for this control will be added in the response.

Loaded: it controls the creation of control, i.e., if it is true then only the control is going to be created else it will not be created.

Coming to my problem, I moved my code from rendered to loaded property and everything is working fine. The custom control is not being created so there is no possibility of execution of any code inside that custom control.

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