Hi all, quick question about this known issue: 

https://success.salesforce.com/issues_view?id=a1p3A0000001CiWQAU

We are experiencing the same thing in Spring '18 and Winter '19... If admin is in Lightning Experience and tries to login as a user who is LEX enabled, sometimes (not always) the login as will not complete and the admin is forcefully logged out or directed back to the user detail page.  

If we use the workaround (switch back to classic) -- that works consistently. 

However, since this particular Known Issue notes "No Fix"... wondering if there may be a fix planned in the future?

Thanks!