We are seeing a small change to the output of "to_nice_yaml" and "to_yaml" 
when using ansible-core 2.12 versus 2.11.5 and older. The changes are only 
about escaping for wrapped multi-line strings.

If this in on purpose, please let me know how I can get the older ansible 
versions to produce the same output.

Thanks
Claus

Simple playbook:
- hosts: localhost
gather_facts: false
vars:
test_var: |
test line 1 which is very long so it wraps around during templating 
..................
test line 2 which is indented
tasks:
- debug:
msg: '{{ lookup("template","test.j2") }}'
- debug:
msg: '{{ lookup("template","test.j2") | from_yaml }}'
- debug:
msg: '{{ lookup("template","test.j2") | from_yaml | to_nice_yaml(indent=2, 
sort_keys=False) }}'

And very simple template:
test: |
{{ test_var | indent(2,false) }}

Output from 2.11.5:
TASK [debug] 
**********************************************************************************************************************************************************************************
tirsdag 09 november 2021 10:54:14 +0100 (0:00:00.013) 0:00:00.013 ****** 
ok: [localhost] => { "msg": "test: |\n test line 1 which is very long so it 
wraps around during templating ..................\n test line 2 which is 
indented\n" } TASK [debug] 
**********************************************************************************************************************************************************************************
 
tirsdag 09 november 2021 10:54:14 +0100 (0:00:00.025) 0:00:00.039 ****** 
ok: [localhost] => { "msg": { "test": "test line 1 which is very long so it 
wraps around during templating ..................\n test line 2 which is 
indented\n" } } TASK [debug] 
**********************************************************************************************************************************************************************************
 
tirsdag 09 november 2021 10:54:14 +0100 (0:00:00.030) 0:00:00.069 ****** 
ok: [localhost] => { "msg": "test: \"test line 1 which is very long so it 
wraps around during templating ..................\\n\\\n \\ test line 2 
which is indented\\n\"\n" } 

Output from 2.12.0:
TASK [debug] 
**********************************************************************************************************************************************************************************
tirsdag 09 november 2021  11:03:48 +0100 (0:00:00.014)       0:00:00.014 
****** 
ok: [localhost] => {
    "msg": "test: |\n  test line 1 which is very long so it wraps around 
during templating ..................\n    test line 2 which is indented\n"
}

TASK [debug] 
**********************************************************************************************************************************************************************************
tirsdag 09 november 2021  11:03:48 +0100 (0:00:00.028)       0:00:00.042 
****** 
ok: [localhost] => {
    "msg": {
        "test": "test line 1 which is very long so it wraps around during 
templating ..................\n  test line 2 which is indented\n"
    }
}

TASK [debug] 
**********************************************************************************************************************************************************************************
tirsdag 09 november 2021  11:03:48 +0100 (0:00:00.029)       0:00:00.072 
****** 
ok: [localhost] => {
    "msg": "test: \"test line 1 which is very long so it wraps around 
during templating ..................\\n\n  \\ test line 2 which is 
indented\\n\"\n"
}




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