Your logic looks sound. Did a quick search on these forums and looks like a few others have had some issues with the Hue dimmer paired directly to HE while others seem fine like this thread:
My money is on the dimmer based on the handful of other threads I found on this site but if it was me, just to be safe I would try to run the rule you have here a few different ways to figure out if itās an issue with the dimmer, the conditional actions, the scene, or the individual devices youāre trying to turn on.
Some examples:
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If you remove the conditional actions, can you trigger a single hue light (not group) on/off with a press of button 1?
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If so, will your conditional actions on the dimmer trigger for a non-hue product?
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If you create a virtual button and swap the trigger from your hue dimmer to the new virtual... does your rule work with the virtual button press?