Generated config collections cannot be written
What changes in Generated config collections cannot be written compared with MongoDB and what your application has to do.
This difference is of the Stronger guarantee kind.
What MongoDB does
A mongos accepts writes to collections such as config.shards, and then loses its list of shards.
What TeselaDB does
Writing to a generated config collection or creating one answers IllegalOperation.
What your application has to do
Use the sharding commands instead of writing to config.