Steps to reproduce the issue

Login to Joomla 4.0.0 beta 1 frontend with sample data as a super admin
Click template settings pages you to
You are now at https://example.com/index.php/working-on-your-site/template-settings?view=templates
(Make a mental note of the breadcrumbs)
Click Select
(Make a mental note this is a model)
Select image and click select
Click save
You are now at https://example.com/index.php/component/config?view=templates
(Make a mental note of the breadcrumbs - they have changed - but we are still in edit mode)
click select to launch the image section model again

Expected result

the media manager loads - again

Actual result

a Joomla error page, actually a 404 error handled by Joomla

System information (as much as possible)

Tested on safari and chrome on Mac

Additional comments