copy_to_distributed_table in contrib package fails to mark inactive shards

If I shutdown(ctrl + c) copy_to_distributed_table while it is working, it fails to mark shards on closed node as inactive. If I wait copy_to_distributed_table to complete, then it marks shards inactive on closed node as properly.

Here are steps to replicate problem;
1. Start a 2+1 pg_shard cluster.
2. Create customer_reviews table as in pg_shard documentation and create shard placements.
3. Shutdown one of the worker nodes.
4. Start copy_to_distributed_table
`/usr/local/pgsql/bin/copy_to_distributed_table -CH -n NULL customer_reviews_1998.csv customer_reviews`
5. And shutdown (ctrl + c) it, before it completes.
6. Check pgs_distribution_metadata.shard_placement and see none of shard placements are marked as inactive.
7. Run queries…
1. Run `select count(*) from customer_reviews;`
2. Start closed worker node.
3. Again run `select count(*) from customer_reviews;` and see results are different.