How can anyone securely start a new job with a probationary period if they have a mortgage to pay?

We are due to complete on our new house within the next month and we know it would be stupid to change job before we move in, however my partner has just been offered a better paid job within the same industry but there would be a 3 month probation period… How can anyone feel safe changing jobs when they can t be guaranteed a job after the 3 months?

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