GitHub code folding - the last block does not get a folding arrow

[sabi0]

I have some YAML files describing a bunch of instances for Kubernetes deployment. And I noticed that all the instances are foldable except for the last one in a file:

Here "prod2x" and "class-prod" blocks have the exact same layout. And the "class-prod" is the last one in the file.

instances:
- name: prod2x:
   source:
    revision: deadbeef
- name: class-prod
  source:
    revision: cafebabe