Answered
If both views ("graphic" and "graphic 2") are visible, and the reset icon is activated, the reset icon is shown in "graphic" view only (not in "graphic 2"), but regretfully the upper right corner of "graphic 2" view seems to be overlayed by an invisible reset icon which reacts on clicking into this area with resetting the applet as well. Even a user defined button in the upper right corner of "grpahic 2" view is overlayed.
In my sample applet you can check this behaviour: https://www.geogebra.org/m/zdbunym9
Is there a way to deactivate this invisible reset icon in the "graphic 2" view, while having it visible in "graphic" view?
The same question 
Thanks - we'll check but probably won't be able to fix it too soon
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