Encoding to yaml only encodes the first document to a string

[mackaybe]

Describe the bug
Encoding to yaml only encodes the first document to a string

Note that any how to questions should be posted in the discussion board and not raised as an issue.

Version of yq: 4.42.1
Operating system: osx or linux
Installed via: homebrew and manual build

Input Yaml

foo.yml:

build: no
data:
  test.yaml: |
    a: b
    type: plain
    ---
    c: d
    type: juicy
    ---
    e: f
    type: greenish

Command
The command you ran:

yq '.data."test.yaml" = (.data."test.yaml" | from_yaml | select(.type == "juicy").c = "DD" | to_yaml)' foo.yaml

Actual behavior

build: no
data:
  test.yaml: |
    a: b
    type: plain

Expected behavior

build: no
data:
  test.yaml: |
    a: b
    type: plain
    ---
    c: DD
    type: juicy
    ---
    e: f
    type: greenish

Additional context

I get the same result for this:

export manifests=$(yq '.data."test.yaml"' foo.yaml | yq 'select(.type == "juicy").c = "DD"')
yq '.data."test.yaml" = env(manifests)' foo.yaml

this works as expected

yq '.data."test.yaml"' foo.yaml | yq 'select(.type == "juicy").c = "DD" | to_yaml'

[mackaybe]

4.44.1 has same issue on osx

[mikefarah]

Verified - needs fix