Rxdb migration is not running

Question

I have a schema with version 0, and 4k docs with it. Changing version to 1, have the following strategy:

  autoMigrate: true,
  migrationStrategies: {
    1: (r: any) => {
      debugger;
      console.log(r);
      return r;
    }
  },

reload the page, nothing is printed, debugger is not stopped. I tried to follow the code in data-migration.js, it looks like getBatchOfOldCollection returns an empty batch. What can cause it? I tried to run the migration manually with the same result.