Unable to create new snapshot

Old snapshots work fine - they launch and work, but when trying to create a new snapshot we encounter a problem
Finished running 1 snapshot in 0 hours 0 minutes and 5.82 seconds (5.82s).
06:12:32
06:12:32 Completed with 1 error, 0 partial successes, and 0 warnings:
06:12:32
06:12:32 'NoneType' object has no attribute 'lower'

However, if you create a table manually and then run this new snapshot from dbt, it will work.

Reproduce the failure when creating a new snapshot, then compare it with an existing snapshot and with a manually created table. Trace the `'NoneType' object has no attribute 'lower'` error through the dbt-ClickHouse snapshot path. Done means new snapshots can be created successfully while existing snapshots continue to work.

Written by the indexing model from the issue text.