Site Editor beta not loading template-parts for Wizzie child theme

[bobbingwide]

While the Wizzie theme appears to work in the front end it's not possible to use the current version in the Site Editor.

REST requests to load the template parts are failing with 404s.

For the front-page.html file the failing requests are of the form:

GET /wp-json/wp/v2/template-parts/fizzie//page-content?context=edit&_locale=user HTTP/1.1

and the responses are:

{"code":"rest_template_not_found","message":"No templates exist with that id.","data":{"status":404}}

The source being used for this particular request was

<!-- wp:html -->
<div class="WP_DEBUG">front-page.html</div>
<!-- /wp:html -->

<!-- wp:template-part{ "slug":"issue-39", "theme":"fizzie" } /-->

<!-- wp:template-part {"slug":"header", "align":"full", "tagName":"header" } /-->

<!-- wp:template-part {"slug":"page-content","theme":"fizzie","align":"wide","layout":{"inherit":true} } /-->

<!-- wp:template-part {"slug":"search","theme":"fizzie","layout":{"inherit": true }} /-->

<!-- wp:template-part {"slug":"page-footer","theme":"fizzie", "tagName":"footer","layout":{"inherit": true }} /-->

<!-- wp:template-part {"slug":"footer","theme":"fizzie"} /-->

<!-- wp:template-part {"slug":"footer-menu","theme":"fizzie", "className": "footer-menu" } /-->

The screen capture reflects the "errors" that have occurred with rather useless empty blocks.

Workarounds

1. Eliminate the "badly formed" block, such as the issue-39 template part, which produces the "this block has encountered..."
2. Remove "theme":"fizzie" from the other template parts.
3. The easiest way to do this would be to copy the template from Fizzie to Wizzie.