Unable to update Site when bulk-editing VLAN Groups

[stuntguy3000]

NetBox version

v3.6.2

Python version

3.8

Steps to Reproduce

1. Select one or more VLAN Groups
2. Click on Edit Selected
3. Select a Site and submit the form

Expected Behavior

Ideally, the VLAN Group Bulk Edit form should reference the scope of the VLAN to edit, not a site specifically.

Observed Behavior

<class 'TypeError'>

Direct assignment to the reverse side of a related set is prohibited. Use site.set() instead.

Python version: 3.8.10
NetBox version: 3.6.2
Plugins: 
  netbox_demo: 0.3.1