When INSERT .. SELECT produces an error/warning which reports the number of the problematic row, this number is wrong when SELECT is performed from the same table.
create or replace table t (a tinyint);
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insert into t values (1),(100);
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insert into t select a*2 from t;
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10.7 d552e092c9f3
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MariaDB [test]> insert into t select a*2 from t;
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ERROR 1264 (22003): Out of range value for column 'a' at row 4
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Consequently, ERROR_INDEX from MDEV-10075 is also wrong.
If the the same values are insert-selected from a different table, the counter is correct:
MariaDB [test]> create or replace table tmp select * from t;
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Query OK, 2 rows affected (0.044 sec)
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Records: 2 Duplicates: 0 Warnings: 0
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MariaDB [test]> insert into t select a*2 from tmp;
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ERROR 1264 (22003): Out of range value for column 'a' at row 2
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Critical MDEV-10075 Provide index of error causing error in array INSERT
