Some settings pages have default tabs. We recently introduced default tabs on config entities at all times in #2085907: Ensure all configuration entities have an Edit/Configure tab by default → , but that is not true for general settings pages. It is hard in core and contrib to extend settings pages, because you never can be sure if it already has an edit tab or not and may need to add one of your own. Eg. 'Account settings' has a default 'Settings' tab because it expects if you have Field UI module enabled, it would add more tabs on it. If that would not be the case, it would not have a default 'Settings' tab. Now if you look at Site information or RSS settings, those don't *expect* additional tabs, so they don't have a default tab.
This is wrong.
Making core assumptions about which pages may be extended in contrib, so those where this expectation was not there may end up contrib modules trying to add default tabs with different paths/labels, etc. is a problem.
The tab system should be intelligent enough that if there is no default tab, it should add one. It could take the label (and sub-path segment) of that from the parent route with a new syntax. Alternatively people need to manually define a default tab at all times on all routes.
Decide if we can/want to autogenerate or want to go manual.
No ui changes for core. Enabling contrib modules that want to add more tabs will make the default tab show up. However until such a module is enabled, the default tab would not show.
Figure out.
Needs work
11.0 🔥
The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.