When importing a Package, previewing makes unexpected changes to Cacti Templates

[TheWitness]

Describe the bug

Just observed this. Need to confirm that it's not me seeing things first.

To Reproduce

Steps to reproduce the behavior:

1. Create an install and install one Package Only

2. Preview another Package that has some differences, but don't import

3. Go to some other portion of the Cacti UI

4. Go back and preview again. Note it does not show differences

Expected behavior

Differences should remain visible after a preview.