I have a very simple sequence Find Image > Find Children > Log Message
When in debug mode the locals panel populates for a few of the activities, but clears out on the last one after the Find Children.
Commenting out the Find Children activity and debugging the sequence, the Locals panel will populate at the break point placed on the the Log Message activity.
Thanks for the report, I registered it in our issue tracker.
For the record, I couldn’t reproduce it on latest Community Edition with your activity packages verions (System and UiAutomation), but our team will have a look.
Please try updating activity packs just as a test.