Dedupe cache not clearing

After running a Find and Merge Duplicates process on a group, the results are not updated until a Cleanup Cache and Update Paths process is run.

To reproduce:
Create a group that will result in duplicates being found on at least one group member.
Run Find and Merge Duplicates wizard.
Do not merge duplicates, but rather change the group so that other duplicates should be included.
Re-run Find and Merge Duplicates wizard.
Note that new duplicates are not added to the list.
Run Cleanup Cache and Update Paths
Re-run Find and Merge Duplicates wizard.
Note that new duplicates are added to the list.

CiviCRM 4.7.13
Wordpress 4.6.1
MySQL 5.1.73
CentOS 6.8
Apache 2.2.15
PHP 5.4.40-4.el6 @centos-sclo-rh