When other modules try to provide information about local tasks, a developer takes a look at or steps through code, local tasks should sport their provider when using getPluginDefinition.
Add 'provider' information / index to array in DynamicLocalTasks.php
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Yes please. Without this fix, this module causes a fatal error with the entity_ui module because that module attempts to get this module's label in the EntityTabListBuilder class.
Completely correct to add provider to tabs created by a derivative plugin.