Summary

If a user has a username with a space in it upon creating their personal space, the space key will replace the space by a + character.
This will cause the space to not load with Confluence new design as all link with this + sign will not load.

Steps to Reproduce

1. Attempt to reach a page where the URL includes a + sign in its space key.

Expected Results

The page loads properly.

Actual Results

The page loads forever.

Workaround

You can either replace the + sign in the URL by %20 for the page to load properly or disable Confluence new design.
You can disable the new design by clicking on your profile picture in the bottom left then Turn off for now button.