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This error message is coming directly from MongoDB and while very generic, it is telling us that the driver is unable to handle the data that is being sent to MongoDB.
When publishing a workflow that contains a MongoDB Input tool, a validation error is thrown. However, the workflow runs successfully once on the gallery.
When utilizing the provided back up script in community as is (shorter version), in certain cases this can cause the service to crash if the machine's resources are not optimal. It also can have the side effect of causing the Mongo backup to take longer than normal.
When migrating a MongoDB to a new machine all the relevant steps in https://help.alteryx.com/20201/server/server-host-recovery-guide (use document for your Server version) should be followed. Skipping steps can cause issue occurring later.