I've just completed upgrading three sites (in a multi-site configuration) from Drupal 7 to 9. For the first two simple sites, all is well. However for the third site, which has its own content types that make use of many field types, things are not so good.
When I view any node of any type (eg. page, story, one of my custom types), whether in teaser mode on the home page or in full mode, only the title is displayed. The summary text, body and any fields are not.
I've checked the DB and the content was migrated successfully, eg. the summary, body and so on is present. Similarly, if I edit any node, I can see the body.
The problem occurs when using the standard Bartik theme. I was using a subtheme of Garland on D7. I switched to a subtheme of Bartik (using Twig templates) for D9 and this works fine on my two simple sites.
I've turned on Twig debugging and this is what I see in the output:
<!-- THEME DEBUG -->
<!-- THEME HOOK: 'field' -->
<!-- FILE NAME SUGGESTIONS:
* field--node--body--match-report.html.twig
* field--node--body.html.twig
* field--node--match-report.html.twig
* field--body.html.twig
x field--text-with-summary.html.twig
* field.html.twig
-->
<!-- BEGIN OUTPUT from 'core/themes/bartik/templates/classy/field/field--text-with-summary.html.twig' -->
<div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"></div>
<!-- END OUTPUT from 'core/themes/bartik/templates/classy/field/field--text-with-summary.html.twig' -->
So it would appear that the body field is being rendered, but with not actual value. That is, the field--text-with-summary.html.twig template is executed, however nothing is rendered.
At @2pha's suggestion, I've checked the logs and found the following two errors of type migrate_drupal_ui occurred during the upgrade many times over:
Source ID 282: Missing bundle for entity type node (/home/foo/drupal-9.3.2/core/lib/Drupal/Core/Entity/ContentEntityStorageBase.php:124)
Missing bundle for entity type node (/home/foo/drupal-9.3.2/core/lib/Drupal/Core/Entity/ContentEntityStorageBase.php:124)
The following error occurred a few times post-upgrade:
A non-existent config entity name returned by FieldStorageConfigInterface::getBundles(): entity type: node, bundle: image, field name: taxonomyextra
I've played around for a while and I'm now stuck. Any suggestions on how to debug this further?
