The innodb test suite is not supposed to be run with InnoDB plugin or XtraDB. In this particular case there are two different versions of the test case in suite/innodb/t/innodb_bug56143.test and suite/innodb_plugin/t/innodb_bug56143.test, because the syntax accepted by the built-in version is not compatible with the plugin.
In MySQL mysql-test-run automatically runs the server with either builtin InnoDB or the the plugin based on the test case contents. In Percona Server, mysql-test-run is confused by innodb_swap_builtin_plugin.patch, so it seems to always run the server with XtraDB regardless of the test case contents.
So there is a problem with mysql-test-run or innodb_swap_builtin_plugin.patch that should be fixed, but this particular test failure is harmless and can be ignored.
The innodb test suite is not supposed to be run with InnoDB plugin or XtraDB. In this particular case there are two different versions of the test case in suite/innodb/ t/innodb_ bug56143. test and suite/innodb_ plugin/ t/innodb_ bug56143. test, because the syntax accepted by the built-in version is not compatible with the plugin.
In MySQL mysql-test-run automatically runs the server with either builtin InnoDB or the the plugin based on the test case contents. In Percona Server, mysql-test-run is confused by innodb_ swap_builtin_ plugin. patch, so it seems to always run the server with XtraDB regardless of the test case contents.
So there is a problem with mysql-test-run or innodb_ swap_builtin_ plugin. patch that should be fixed, but this particular test failure is harmless and can be ignored.