failover to async replica in healthy synchronous_mode cluster return 503 about patroni HOT 2 CLOSED

[postgres@postgres-6c8b5c3b-2-0 /]$ patronictl list
+ Cluster: postgres-6c8b5c3b (7325362323166597275) -+-----------+----+-----------+
| Member                | Host       | Role         | State     | TL | Lag in MB |
+-----------------------+------------+--------------+-----------+----+-----------+
| postgres-6c8b5c3b-0-0 | 245.0.1.35 | Sync Standby | streaming |  2 |         0 |
| postgres-6c8b5c3b-1-0 | 245.0.0.42 | Replica      | streaming |  2 |         6 |
| postgres-6c8b5c3b-2-0 | 245.0.1.21 | Leader       | running   |  2 |           |
+-----------------------+------------+--------------+-----------+----+-----------+
[postgres@postgres-6c8b5c3b-2-0 /]$ patronictl version
patronictl version 3.2.2
[postgres@postgres-6c8b5c3b-2-0 /]$ patronictl list
+ Cluster: postgres-6c8b5c3b (7325362323166597275) -+-----------+----+-----------+
| Member                | Host       | Role         | State     | TL | Lag in MB |
+-----------------------+------------+--------------+-----------+----+-----------+
| postgres-6c8b5c3b-0-0 | 245.0.1.35 | Sync Standby | streaming |  2 |         0 |
| postgres-6c8b5c3b-1-0 | 245.0.0.42 | Replica      | streaming |  2 |         0 |
| postgres-6c8b5c3b-2-0 | 245.0.1.21 | Leader       | running   |  2 |           |
+-----------------------+------------+--------------+-----------+----+-----------+
[postgres@postgres-6c8b5c3b-2-0 /]$ patronictl failover --candidate postgres-6c8b5c3b-1-0 --force
Current cluster topology
+ Cluster: postgres-6c8b5c3b (7325362323166597275) -+-----------+----+-----------+
| Member                | Host       | Role         | State     | TL | Lag in MB |
+-----------------------+------------+--------------+-----------+----+-----------+
| postgres-6c8b5c3b-0-0 | 245.0.1.35 | Sync Standby | streaming |  2 |         0 |
| postgres-6c8b5c3b-1-0 | 245.0.0.42 | Replica      | streaming |  2 |         0 |
| postgres-6c8b5c3b-2-0 | 245.0.1.21 | Leader       | running   |  2 |           |
+-----------------------+------------+--------------+-----------+----+-----------+
2024-01-18 17:13:36.78836 Successfully failed over to "postgres-6c8b5c3b-1-0"
+ Cluster: postgres-6c8b5c3b (7325362323166597275) --------+----+-----------+
| Member                | Host       | Role    | State     | TL | Lag in MB |
+-----------------------+------------+---------+-----------+----+-----------+
| postgres-6c8b5c3b-0-0 | 245.0.1.35 | Replica | streaming |  2 |         0 |
| postgres-6c8b5c3b-1-0 | 245.0.0.42 | Leader  | running   |  2 |           |
| postgres-6c8b5c3b-2-0 | 245.0.1.21 | Replica | stopped   |    |   unknown |
+-----------------------+------------+---------+-----------+----+-----------+