Steps to reproduce the issue

Update Joomla 3.8.5 to 3.8.6.
See the Extensions manager: Manage
The following fields are empty from the Session Data Purge plugin: Version, Date and Author.
See image (1).

Expected result

All the fields have been completed.

Actual result

Also, see the additional comments.

System information (as much as possible)

Does not apply.

Additional comments

After a whole new installation of Joomla 3.8.6 the concerning fields are not empty. OK
See image (2).

1. Unwanted situation = Actual result
   
2. Wanted situation