yq e removes '---' header

[KauzClay]

Describe the bug
When I use yq, it removes the --- marker of my yaml document

Version of yq: 4.30.5
Operating system: mac
Installed via: homebrew

Input Yaml

example.yaml:

#! some ytt comments 
#@ a = b

---
kind: First
value: 1
---
kind: Second
value: 1

Command

❯ yq e  ' select(documentIndex == 0 ) ' example.yaml

Actual behavior

#! some ytt comments
#@ a = b
kind: First
value: 1

Expected behavior

#! some ytt comments
#@ a = b

---
kind: First
value: 1

Additional context
Sorry to bring this back up again, I'd gone through #351 and #1056 before reporting.

Strangely, if I don't have that empty line before the --- and input document looks like this:

#! some ytt comments 
#@ a = b
---
kind: First
value: 1
---
kind: Second
value: 1

Then it behaves how I'd expect:

❯ yq e  ' select(documentIndex == 0 ) ' /tmp/example.yaml
#! some ytt comments
#@ a = b
---
kind: First
value: 1

[mikefarah]

Found the bug, will fix in the next release

[mikefarah]

Fixed in v4.30.6