Presently when a new quick tab is created you have to go manually flush all of your system cache to embed it either through the block UI or layout systems like panels. This is because the block plugin discovery results are cached. But clearing all of your cache for the sake of one small portion of the cache is inefficient and not often feasible on larger sites. Additionally you may want to allow site builders to add tabs on demand, but may not want to let them clear your system cache.
Invalidate the block plugin discovery cache on save. This will force Drupal to rebuild the block plugin list and should make the entities instantly available to use.
Fixed
3.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Given 📌 Manually clear cache keys from plugin managers with finite variations instead of using cache tags Fixed and the change in directions from 📌 Allow plugin derivers to specify cache tags for their definitions Postponed: needs info , I think this is good as implemented
Automatically closed - issue fixed for 2 weeks with no activity.