MissingMandatoryParametersException "paragraphs_type" [#3587229]

Problem/Motivation

I'm seeing the error,

Symfony\Component\Routing\Exception\MissingMandatoryParametersException: Some mandatory parameters are missing ("paragraphs_type") to generate a URL for route "entity.paragraphs_type.edit_form". in Drupal\Core\Routing\UrlGenerator->doGenerate() (line 189 of core/lib/Drupal/Core/Routing/UrlGenerator.php).

Proposed resolution

In src/Entity/ParagraphsType.php, lines 85-86, paragraphs_type should be in {curly braces} instead of [square ones].

Remaining tasks

Make a MR.

Issue fork paragraphs-3587229

Show commands

Start within a Git clone of the project using the version control instructions.

Add & fetch this issue fork’s repository

Or, if you do not have SSH keys set up on git.drupalcode.org:

Add & fetch this issue fork’s repository

3587229-missingmandatoryparameters changes, plain diff MR !251
Check out this branch for the first time

Check out existing branch, if you already have it locally