After setting runaway, got an unexpected error `Coprocessor task terminated due to exceeding the deadline`

[CabinfeverB]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

ALTER RESOURCE GROUP rg1 QUERY_LIMIT=(EXEC_ELAPSED='60s', ACTION=KILL, WATCH=SIMILAR DURATION='10m');

2. What did you expect to see? (Required)

get error Query execution was interrupted, identified as runaway query

3. What did you see instead (Required)

got error Coprocessor task terminated due to exceeding the deadline

4. What is your TiDB version? (Required)

7.5.0

[CabinfeverB]

/severity major

[CabinfeverB]

/label affects-7.5

[CabinfeverB]

/remove-label may-affects-5.3
/remove-label may-affects-5.4
/remove-label may-affects-6.1
/remove-label may-affects-6.5
/remove-label may-affects-7.1