ERROR 12702 (HY000): Remote table 'test.t#P#p' is not found on INSERT when using partitioning with invalid credentials or invalid socket

INSTALL PLUGIN Spider SONAME 'ha_spider.so';

CREATE TABLE t (c INT) ENGINE=Spider COMMENT='wrapper "mysql", SOCKET "../socket.sock", user "", database "test"' PARTITION BY RANGE (c) (PARTITION p VALUES LESS THAN (10));

INSERT INTO t VALUES (1);

10.5.26-opt>INSERT INTO t VALUES (1);

ERROR 12702 (HY000): Remote table 'test.t#P#p' is not found

11.6.0-dbg>INSERT INTO t VALUES (1);

ERROR 12702 (HY000): Remote table 'test.t#P#p' is not found

11.4.2-dbg>INSERT INTO t VALUES (1);

ERROR 1429 (HY000): Unable to connect to foreign data source: localhost