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Issue reported upstream report at https://jira.mariadb.org/browse/MDEV-27151
also happens in rhel8.x mariadb.

User would like this issue patched.

Problem can be worked around, bug it is preferably to have it corrected in
the rhel package.

Fixed by upstream in:
  https://github.com/MariaDB/server/commit/d48428e99aa7435ff72e2df7da05f35363e90ec3

The first upstream releases containing this fix should be:
  mariadb-10.5.18
  mariadb-10.3.37

Verified on 10.3.39 (expected output from reproducer matches).

mariadb-3:10.3.35-1.module+el8.6.0+15949+4ba4ec26:
 NULL
 NULL
 JSON_VALUE('{"nulltest": null}', '$.nulltest')
 null
 1 + NULL
 NULL
 1 + JSON_VALUE('{"nulltest": null}', '$.nulltest')
 1
 NULL
 NULL
 JSON_EXTRACT('{"a":null, "b":10, "c":"null"}', '$.a')
 null

mariadb-3:10.3.39-1.module+el8.8.0+19444+aac3c36b:
 NULL
 NULL
 JSON_VALUE('{"nulltest": null}', '$.nulltest')
 NULL
 1 + NULL
 NULL
 1 + JSON_VALUE('{"nulltest": null}', '$.nulltest')
 NULL
 NULL
 NULL
 JSON_EXTRACT('{"a":null, "b":10, "c":"null"}', '$.a')
 null