[wp-trac] [WordPress Trac] #57891: Frontend of block theme does not render as expected

[WordPress Trac]

#57891: Frontend of block theme does not render as expected
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 Reporter:  ironprogrammer  |      Owner:  (none)
     Type:  defect (bug)    |     Status:  new
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  Themes          |    Version:  trunk
 Severity:  normal          |   Keywords:  has-screenshots has-testing-info
  Focuses:                  |
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 Instead of displaying a block theme's frontend like that represented in
 the backend editor, posts are displayed in a `<ul>` block. Also, the site
 navigation appears broken.

 Confirmed this behavior with TT3, TT2, and Blockbase. (Unable to repro
 with classic themes like TT1 and TT.) Note that activating Gutenberg
 (tested with `trunk`) results in resolving this issue.

 == Testing Instructions
 These steps define how to reproduce the issue, and indicate the expected
 behavior.

 === Steps to Reproduce
 1. From `wordpress-develop:trunk`, run `npm run build`.
 2. Copy the `build/` folder to a new location, and set it up as a new
 site.
 3. After configuring the site, add a few test posts.
 4. 🐞 With TT3 active (should be by default), load the site frontend, and
 observe that posts are displayed in a list, rather than columns.
 5. 🐞 Try testing with other block themes.

 === Expected Results
 When testing a patch to validate it works as expected:
 - ✅ The frontend of the site should render like that represented in the
 backend editor.

 When reproducing a bug:
 - ❌ The frontend of the site renders with posts in a list, and site
 navigation broken.

 === Supplemental Artifacts
 ||= Backend Editor =||= Frontend ❌ =||
 || [[Image(https://cldup.com/0LC1ninezr.png)]] ||
 [[Image(https://cldup.com/ckIBM-jyZw.png)]] ||

 (Here is an example of the TT theme that does not have this issue:
 https://cldup.com/FH9pnSZ78F.png.)

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Ticket URL: <https://core.trac.wordpress.org/ticket/57891>
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