Multiline String with Trailing Spaces Gets Converted to Single-Line String

[pteroctopus]

Describe the bug
When modifying a YAML file using yq eval with in-place editing, multiline strings that contain trailing spaces are incorrectly converted to single-line strings.

Version of yq: yq (https://github.com/mikefarah/yq/) version v4.45.1
Operating system: macOS
Installed via: Homebrew

Input YAML

orig.yaml:

hello: world
annotations:
  zero: asdf
  one: |
    This is a multi-line string.
    It has multiple lines.
  two: |
    one more line
    Line with spaces at the end    
    Normal line
  three:
    four: five

Command

yq eval '.annotations.one = ""' -i orig.yaml

Actual behavior

The output orig.yaml is modified as follows:

hello: world
annotations:
  zero: asdf
  one: ""
  two: "one more line\nLine with spaces at the end    \nNormal line\n"
  three:
    four: five

The annotations.two field, which originally used the block scalar |, is converted into a single-line string with explicit \n characters.

Expected behavior

Only annotations.one should be modified, while annotations.two should retain its original formatting:

hello: world
annotations:
  zero: asdf
  one: ""
  two: |
    one more line
    Line with spaces at the end    
    Normal line
  three:
    four: five

Additional context

This issue seems to occur when a multiline string contains trailing spaces. The expected behavior is that unmodified fields retain their original block scalar formatting.

[mikefarah]

Yep that's a known issue with the underlying go-yaml parser
Closing as dupe of #566