Drupal 8 Custom Twig Templates not being loaded
Can we start easy? I think 9 times out of 10 when my templates dont load it's due to file naming issues. Do the file names match what's in the database as your content type machine name?

One thing that has happened to me a couple times is I hit enter too soon when creating content in drupal. That ajax just needs a little time to catch up and fill in the machine name. Too soon and your dash_c page could actually be named dash_

Do you have devel enabled? Can you see the *FILE NAME SUGGESTIONS when you "view source" of your webpage?