When installing a profile that doesn't sheep with the right configuration of seven theme for blocks, we end up with administration pages missing tabs.
One way to replicate the problem is to remove these files from profiles/standard:
- block.block.seven_breadcrumbs.yml
- block.block.seven_content.yml
- block.block.seven_help.yml
- block.block.seven_local_actions.yml
- block.block.seven_messages.yml
- block.block.seven_page_title.yml
- block.block.seven_primary_local_tasks.yml
- block.block.seven_secondary_local_tasks.yml
This will get the same result as installing any custom profile missing these files.
After installation, for example, in admin/contents, we have missing blocks for primary tabs:

It's missing the primary tabs (e.g. Files), the breadcrumb and the "Add content" button.
This is an old issue. Not sure if it was already reported and discussed here.
Comments
Comment #2
dxvargas commentedHaving the config files in theme seven will avoid this error.
Submitting patch 3099503-2-move-config.patch
Comment #3
dxvargas commentedTry with different path in patch.
Comment #5
dxvargas commentedThere is a dependency from help... better make the configs optional.
Comment #7
dieterholvoet commentedAny updates on this? Patch looks good to me.
Comment #8
dxvargas commentedPatch is failing to pass because of a Migrate block test, didn't have the chance to analyze this error.
Apart from that it should do the trick. Hope to have the chance to fix the patch, or maybe someone can do it!
Comment #10
pameeela commented@dxvargas thanks for logging and for the patches! This is a duplicate of #2632132: Move Claro standard profile block config into the Claro theme so I'm closing this but added you to the other issue for credit once the fix gets in.