There’s no complete path
Current would try to flow from the second cell’s positive terminal, through the wire, into the first negative, through the cell, out the positive, and then try to cross the insanely resistive air to get back to the negative terminal
Some tiny tiny current flows but like Pico amps not anything meaningful
Electrons at any point in a circuit need to be conserved. If current is leaving the positive terminal then it needs to flow up in the battery from the negative terminal. If there’s no connection to the negative terminal for current to flow into then there’s nothing to replace the charges and it’s like putting your thumb on the end of a straw, the water can’t leave because it forms a vacuum behind it
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