I have a button that launches a flow (flow has a single step to trigger class to run assignment rule)
 

/flow/LeadAssignmentRuleRun?SingleLead={!Lead.Id}&retURL=%2F{!Lead.Id}

This works perfectly in Classic UI, however when launched through the Service Console it renders the classic UI as an iframe before reloading again as Console (not great UX):

SCREENSHOT: Prior to clicking button that launches above URL



SCREENSHOT: After flow finishes and Classic UI is rendered as iframe before reloading as Service Console



The console will then rerender and go back to the correct service console styling

Do I need to change this into a javascript button to handle Classic UI and Service Console separately?

Thanks in advance