issue.field.resolutiondate in History when resolving issue with log time

Note:
So far this seems to occur in the JIRA instance that connected to MySQL database. Not able to get the same result for postgres database.

Steps to reproduce

1. Click on Resolve issue transition
2. Fill in the 'Time Spent' field
3. Proceed with the transition
4. 'issue.field.resolutiondate' appear in the History tab
5. If resolving issue with log time will not have 'issue.field.resolutiondate' in History tab

Sql Dump Log entry:
When using Mysql database with the sql dump turned on, the following sql query was presented when closed the issue with timespent fill in:

2013-03-29 22:09:35,585 http-bio-8528-exec-24 admin 1329x277x1 1okz08v /secure/CommentAssignIssue.jspa 1ms "INSERT INTO changeitem (ID, groupid, FIELDTYPE, FIELD, OLDVALUE, OLDSTRING, NEWVALUE, NEWSTRING) VALUES ('118900', '92700', 'jira', 'resolutiondate', 'null', '2013-03-29 22:09:35.0', 'null', '2013-03-29 22:09:35.254'"

However, such entry didn't shown up in sql dump log when closed and resolve the issue without any timespent fill in.