This comes from looking at WT-15588, where ASAN causes mongod to enable the cursor_copy debug option.  It's a powerful combination that can catch a "use-after-reposition" of a cursor.   It's similar to use-after-free, but is not normally detected by ASAN.

To my knowledge, we're don't specifically set this.  Once easy way might be to alter

  - &format-stress-asan-test
    exec_timeout_secs: 25200
    commands:
      - func: "get project"
      - func: "compile wiredtiger"
        vars:
          <<: *configure_flags_asan_mongodb_stable_clang_with_builtins
          additional_san_vars: export ASAN_OPTIONS="$COMMON_SAN_OPTIONS:unmap_shadow_on_exit=1"
      - func: "format test script"
        vars:
          format_test_script_args: -t 360 

changing the script args to -t 360 - -C "debug_mode=(cursor_copy=true)".

It would be good to have disagg ASAN runs of test/format doing this too.