Hi,
My try to fix it, using version 0.4.7-3:
In comment-reply.dev.js, i add at line 22:
21| parent.value = parentId;
22| t.I('comment_parent').value = parentId;
23| cancel.style.display = '';
This forces comment_parent value to be updated.
I am in no way a javascripter, but this works.
Hope this helps,
Alain