Update your a tag to the following:
<a class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#EditComment{{ $comment->id }}"><i class="fa fa-check-square-o"></i> Edit</a>
To open a bootstrap modal, you have to use the properties specified in the documentation Launch demo modal.
The modal dialog is displayed (means that "a" tag is not missing), but it is dimmed (as is on following screenshot):
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