While investigating WT-11045, I got the following error:
 

[1695693224:904956][2375:0x7fa2297fa700], WT_SESSION.drop: [WT_VERB_DEFAULT][ERROR]: __wt_bad_object_type, 770: unknown object type: : Operation not supported
Exception while dropping tables: Table drop failed for '' in start_tables_drop.

In start_tables_drop, we may throw an error when the drop fails:

                THROW("Table drop failed for '" << uri << "' in start_tables_drop.");

Which is caught by the caller and the workload continues but that thread stops. We should probably not leave it this way as it can go unnoticed and we should figure out why we tried to call drop using an empty URI.