OK, I get it now.
The 'reset' button on a dock has no direct connection to the processor 'reset' signal. Pressing this button is not expected to affect the processor's 'reset' input. That's why there is no electrical connection between the two.
The 'reset' button on the dock is merely a GPIO input to the Omega software. If that software is misbehaving, the button presses may do nothing. In fact, this was the case recently and explains your request to update to the latest image.
In contrast, asserting a reset signal in an embedded system is one of the very few things that absolutely cannot be ignored by the components in that system.
In my opinion, 'reset' is an unfortunate choice of name for the dock's button, but it's just an opinion.
Thanks for the prompt response!