The ONLY way to get around thisissue is to use the Accessibility features in the Settings app.
Go into the Settings app, Accessibility, Touch, toggle ON Assistive Touch. Customize Top Level Menu.
You can add menu buttons that show up when you tap the Accesibility software, virtual button that appears on your Home screen.
You can set these top level menu buttons to anything.
One of the options is the create a screenshot button.
OR
Another method, once Assistive Touch is toggled ON
Under Custom Actions, you can assigned a Single tap, Double tap or long press of the virtual Assistive touch button to do a screenshot action.
I use the virtual Assistive Touch screen button and have it setup for a Single tap of that software button to return to the Home screen, Double tap for a screenshot and a long press ( of a certain duration ) to activate the Siri assistant.
Good Luck to You!