Spurious comment line duplication in yq v4.50.1

[andry81]

May be related to: #2572

test.yml:

# This file is automatically generated by ...
#

content-index:

  timestamp: "2026-01-16T00:00:00Z"

Test:

yq.exe e ".\"content-index\".timestamp=\"123\"" test.yml > test2.yml

Tested versions: 4.50.1, 4.49.2 (amd64)

4.49.2:

# This file is automatically generated by ...
#
content-index:
  timestamp: "123"

4.50.1:

# This file is automatically generated by ...
#
# 
content-index:
  timestamp: "123"