Puppet 7.6 breaks dot notation for custom facts (regression)

Puppet Version: 7.6.1, 7.7.0
Puppet Server Version: -
OS Name/Version: Windows 10

Puppet 7.6.1 (and also 7.7.0) breaks the dot notation for custom facts.

To reproduce the problem, create an empty directory (A) and inside this directory, create the following subdirectories:

site\modules\profiles\facts.d

Inside the facts.d directory, create a file called fact_test.ps1 and fill it with this content

Write-Host 'mycustom_fact.mysubfact=abc' 

Then from the top directory (A), call this:

puppet facts --environmentpath=. --environment=site

Desired Behavior:

The output should contain something like this:

"mycustom_fact": {

    "mysubfact": "abc"

}

Actual Behavior:

This works up to Puppet 7.5.0. Starting with Puppet 7.6.1, the output is like this:

"mycustom_fact.mysubfact": "abc"

The release notes don't mention anything about this change. In any case, for us this is a breaking change because we have Puppet scripts that rely on the version 7.5 behavior.