`yq head_comment` strange behavior

[kristeey]

Describe the bug
head_comment operator does fetch the head comment for one document, but not for another document which is basically configured in the same manner.

Version of yq: 4.45.1
Operating system: mac
Installed via:

• Homebrew (mac)

Input Yamls
Document 1:
data1.yaml:

# flux-tenant-name: flux-tenant1-sync
---
apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
resources:
  - app1.yaml

Document 2:
data2.yaml:

# flux-tenant-name: flux-tenant2-sync
---
apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
resources:
  - app2.yaml

Command
The command you ran:

yq 'head_comment' "data1.yaml"
yq 'head_comment' "data2.yaml"

Actual behavior

flux-tenant-name: flux-tenant1-sync

Expected behavior

flux-tenant-name: flux-tenant1-sync
flux-tenant-name: flux-tenant2-sync

Additional context
I first experienced this on a Linux runner using the same version of YQ mentioned above. I found a workaround using yq '... | headComment | select(. != "")' "data2.yaml" which provides the correct result.