I do not think there is an official way to achieve this. You will probably need your hands dirty in the database to do this. I will try to create a fictitious problem in your project that will create problem 1. Then go to the database, find the issues table and edit the position column to number one before you start, and then resolve it. Theoretically, the next problem will be the number you want to start with.
I have not tested this. If this really works, it could possibly lead to long-term issues being broken with other features or problems with future updates.
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