It’s not unprofessional, I truly regret sticking out at my first startup for nearly eight months when the red flags started being waved in my first weeks. But,

It’s not unprofessional, I truly regret sticking out at my first startup for nearly eight months when the red flags started being waved in my first weeks. But, no matter what hiring managers say, they will absolutely hold a short stint against you, regardless of the circumstances, so if possible arrange a new role before quitting.