Packaging or Launching the 2D Side Scroller template without making any edits results in issues that differ by browser.
Firefox : A black screen appears (see screenshot)
Chrome : 1/4th of the screen appears but is still not rendering correctly and no input is taken (see screenshot)
Regression?: No
This occurred in 4.19
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-65986 in the post.