There is too little information to regard the breaking glass as having no meaning.
Yes, there is too little. That's why the story puts it in passive voice: "when a pane of glass broke", with no actor or apparent intent, because it isn't known.
That also means you don't get to just make it up because you'd like the script to go a certain way. We're not writing screenplays here.
Now this human being should have reasonable caution not to ramp up the home owners anxiety by breaking glass. That invites a defensive response.
Again, you just pointed out yourself you don't know WHO broke the glass, so you don't know it "ramped up the homeowner's anxiety". Again, you're making up shit that isn't there.