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 4.0.6.3215 2025.06.25 6461d P P 598 405 2025.06.30 07:56:58.062 2025.06.30 07:56:58.660 2025.06.30 06:55:13.332 2025.06.30 06:55:13.737
2 4.0.6.3214 2025.06.21 e11f6 P P 628 428 2025.06.25 12:50:06.379 2025.06.25 12:50:07.007 2025.06.25 11:48:01.644 2025.06.25 11:48:02.072
3 4.0.6.3213 2025.06.14 f015c P P 616 407 2025.06.21 07:50:42.720 2025.06.21 07:50:43.336 2025.06.21 06:48:21.636 2025.06.21 06:48:22.043
4 4.0.6.3212 2025.06.11 bc50d P P 602 396 2025.06.14 08:18:22.890 2025.06.14 08:18:23.492 2025.06.14 07:15:26.720 2025.06.14 07:15:27.116
5 4.0.6.3208 2025.06.10 19fe3 P P 616 440 2025.06.11 06:45:17.939 2025.06.11 06:45:18.555 2025.06.11 05:43:22.854 2025.06.11 05:43:23.294
6 4.0.6.3207 2025.06.07 205ff P P 656 435 2025.06.10 06:46:43.455 2025.06.10 06:46:44.111 2025.06.10 05:44:00.479 2025.06.10 05:44:00.914
7 4.0.6.3206 2025.05.22 d7d10 P P 623 405 2025.06.06 06:40:18.573 2025.06.06 06:40:19.196 2025.06.06 05:39:03.673 2025.06.06 05:39:04.078

Elapsed time, ms. Chart for last 7 runs:

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