drupal 8 – "contextual links" (in place editing links) not appearing …

After updating my Drupal 8 development sites, I’ve noticed that the “contextual links”(sometimes called in place editing links) for editing no long appear on any content: nodes, blocks, views, or anything else.

Does anyone have any information about the problem and if so how to fix it?

Hunting for possible software problems in the “issues” list has not been helpful.

https://www.drupal.org/project/issues/drupal?text=quick&status=All&prior…

The Drupal 8 “quick edit” module is enabled.

Is anyone else observing this abnormal behavior in Drupal 8?

Can anyone shed some light on this?

p.s. in “Drupal 7” these were called “contextual links”

https://www.drupal.org/docs/7/administering-drupal-7-site/working-with-c…

Drupal version: 


Source: https://www.drupal.org/taxonomy/term/22/feed