invalid non-zero objectSubId for object class

On a 12.3 AWS RDS instance, I get the following error when trying to drop
either of two tables:

dev=> drop table current_flight;
ERROR: invalid non-zero objectSubId for object class 297108
dev=> drop table flight;
ERROR: invalid non-zero objectSubId for object class 297108

I can create and drop new tables, but these two I cannot drop.

Both tables were at one point replicated using pglogical, but I've removed
them from their replication sets and nothing depends on them that I can
see. The replication of other tables is still proceeding normally.

Anyone have any thoughts on this? The db was also upgraded seemingly
successfully from 12.2 a couple of days ago and otherwise seems to be
working fine.

Thanks for any pointers!

-Michel