value is not allowed in this context error on merge with additional property

[dastrobu]

Describe the bug
There is value is not allowed in this context error on merge with an additional property instead of unmarshalling the yaml correctly.

To Reproduce

Unmarshal:

foo: &bar
  biz: buz
mergeMe:
  !!merge <<: *bar
  foo: bar

produces:

Unmarshall() error = [6:3] value is not allowed in this context
           3 |   biz: buz
           4 | mergeMe:
           5 |   !!merge <<: *bar
        >  6 |   foo: bar
                 ^

Expected behavior

The equivalent of the following JSON should be the result:

{
  "mergeMe": {
    "foo": "bar", 
    "biz": "buz"
  }, 
  "foo": {
    "biz": "buz"
  }
}

Verify with https://yaml-online-parser.appspot.com

Screenshots
If applicable, add screenshots to help explain your problem.

Version Variables

• Go version: 1.23
• go-yaml's Version: v1.15.10

Additional context
Add any other context about the problem here.

gopkg.in/yaml.v3 can parse the example correctly.

[goccy]

@dastrobu Thank you for your reports !
This problem was caused by !!merge tag. I've fixed this problem with latest release.