[wp-trac] [WordPress Trac] #59258: Some block styles not loading in 6.3.1

[WordPress Trac]

#59258: Some block styles not loading in 6.3.1
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 Reporter:  mmcalister    |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Editor        |    Version:  6.3.1
 Severity:  normal        |   Keywords:
  Focuses:                |
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 On some new WordPress installs with block themes, core styles for the
 navigation and other blocks are not loading.

 [[Image(https://olliewp.com/wp-
 content/uploads/2023/08/Screenshot-2023-08-30-at-10.31.50-PM.png)]]

 [[Image(https://olliewp.com/wp-
 content/uploads/2023/08/IMG_20230830_131936_01.jpg)]]

 This is happening on some fresh installs on live sites (screenshot above
 is from a fresh InstaWP install), but I can't replicate on local dev
 environments.

 A friend initially reached out with this error a few days ago on his site
 using TwentyTwentyTwo. After troubleshooting for hours, I had no fix for
 it. Then, last night, I saw this same issue with my own theme on an
 entirely different server.

 When I switch back to 6.3, this issue is not present.

 This is a hard one to reproduce, but you can see live on this temporary
 theme demo: https://eeable-ape-xaho.instawp.xyz/. If you want to create a
 site and experience the issue live, go to this theme demo site and create
 an admin theme demo: https://demo.olliewp.com/live-demo/

 Go through the setup wizard and click through the steps to create some
 pages. You'll be able to see the issue at the end of the wizard when you
 view the site.

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Ticket URL: <https://core.trac.wordpress.org/ticket/59258>
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