The bleed hole in the middle pane steps in to manage this:
Pressure Regulation: It lets a bit of cabin air pass between the inner and outer panes. This balances the pressure, making sure the outer pane takes most of the load. So the middle pane is ready to step up if the outer one fails.
Safety Backup: By slowly equalizing pressure, the bleed hole stops any one pane from getting all the pressure at once. That makes the system safer and more reliable.
The bleed hole also controls moisture. High up, it gets cold outside, and condensation and frost can form. Without airflow, windows would fog up, blocking your view.
The bleed hole lets a bit of air through, stopping moisture from building up. This keeps the windows clear and ice-free.