v4 multiply operator (merge) dropping object level anchors

[nknotts]

Describe the bug
When using the V4 yq multiply operator, any anchor associated with an object node appears to be dropped in the output.

Version of yq: 4.4.1
Operating system: macOS 11.1
Installed via: homebrew

Input Yaml

a.yml:

foo: &foo-alias
  bar: &bar-alias baz
  a: &c-node
    b: &b-node c

b.yml:

test: &test-alias
  node: &node-alias 1

Command

yq eval-all 'select(fileIndex == 0) * select(fileIndex == 1)' a.yml b.yml

Actual behavior

foo:
  bar: &bar-alias baz
  a:
    b: &b-node c
test:
  node: &node-alias 1

Expected behavior

foo: &foo-alias
  bar: &bar-alias baz
  a: &c-node
    b: &b-node c
test: &test-alias
  node: &node-alias 1

Additional context
When using yq version 3.4.1 command yq merge a.yml b.yml, the expected behavior is generated

[mikefarah]

Looks like this is related to: #677

[mikefarah]

Fixed in 4.5.1

[nknotts]

Confirmed! Thank you so much.

[brewdium]

Confirmed that it's fixed for me too, muchas gracias

[styu99]

I still seem to be having this issue when using the + (append) merge flag @mikefarah

Input yaml
a.yml:

:test:
  :foo: &common
    - PROP_A
  :bar:
    - *common
    - TEST

b.yml:

:test:
  :foo: &common
    - PROP_B

Command
yq eval-all 'select(fileIndex == 0) *+ select(fileIndex == 1)' a.yml b.yml > c.yml
Actual output
c.yml:

:test:
  :foo:
    - PROP_A
    - PROP_B
  :bar:
    - *common
    - TEST

Expected output
c.yml:

:test:
  :foo: &common
    - PROP_A
    - PROP_B
  :bar:
    - *common
    - TEST