functional.sqlancer.tidb_15844_test. NATURAL RIGHT JOIN results in an unexpected "Unknown column" error

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Full history of outcomes and elapsed time, ms:
NN SNAP_INFO CS_outcome SS_outcome CS_run_time SS_run_time CS_run_beg CS_run_end SS_run_beg SS_run_end
1 3.0.13.33814 2025.06.21 85255 P P 628 390 2025.06.28 09:49:32.782 2025.06.28 09:49:33.410 2025.06.28 08:57:02.731 2025.06.28 08:57:03.121
2 3.0.13.33813 2025.06.14 222a9 P P 636 395 2025.06.20 04:14:20.084 2025.06.20 04:14:20.720 2025.06.20 03:21:58.431 2025.06.20 03:21:58.826
3 3.0.13.33811 2025.05.07 16491 P P 686 449 2025.06.14 10:43:16.978 2025.06.14 10:43:17.664 2025.06.14 09:49:50.666 2025.06.14 09:49:51.115

Elapsed time, ms. Chart for last 3 runs:

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