BUG #19580: Can not FINALIZE detach partition. Table in stuck

The following bug has been logged on the website:

Bug reference: 19580
Logged by: Oleg Ivanov
Email address: o15611(at)gmail(dot)com
PostgreSQL version: 18.4
Operating system: Linux
Description:

drop table if exists t;
CREATE TABLE t (id bigint GENERATED BY DEFAULT AS IDENTITY, reg int, primary
key (id, reg)) PARTITION BY RANGE (id);
CREATE TABLE t1 PARTITION OF t FOR VALUES FROM (1) TO (20) PARTITION BY
RANGE(reg);
CREATE TABLE t11 PARTITION OF t1 FOR VALUES FROM (1) TO (10);
ALTER TABLE t DETACH PARTITION t1;
ALTER TABLE t ATTACH PARTITION t1 FOR VALUES FROM (1) TO (20);

"generated by default as identity" was added only to t1 and not in t11.
But, the problem is:
ALTER TABLE t DETACH PARTITION t1 CONCURRENTLY;
ERROR: column "id" of relation "t11" is not an identity column

I can not find a statement to FINALIZE detach:

ALTER TABLE t DETACH PARTITION t1;
ERROR: cannot detach partition "t1"
DETAIL: The partition is being detached concurrently or has an unfinished
detach.
HINT: Use ALTER TABLE ... DETACH PARTITION ... FINALIZE to complete the
pending detach operation.
ALTER TABLE t1 DETACH PARTITION t11;
ERROR: cannot alter partition "t1" with an incomplete detach
HINT: Use ALTER TABLE ... DETACH PARTITION ... FINALIZE to complete the
pending detach operation.
ALTER TABLE t11 ALTER COLUMN id ADD generated by default as identity;
ERROR: cannot add identity to a column of a partition
ALTER TABLE t1 ALTER COLUMN id drop identity;
ERROR: cannot alter partition "t1" with an incomplete detach
HINT: Use ALTER TABLE ... DETACH PARTITION ... FINALIZE to complete the
pending detach operation.
ALTER TABLE t11 ALTER COLUMN id drop identity;
ERROR: cannot drop identity from a column of a partition
ALTER TABLE t ALTER COLUMN id drop identity;
ALTER TABLE
ALTER TABLE t DETACH PARTITION t1 FINALIZE;
ERROR: column "id" of relation "t11" is not an identity column

Table in stuck.

The only way to FINALIZE is to drop section:
drop table t11;
ALTER TABLE t DETACH PARTITION t1 FINALIZE;