A very interesting find. Somehow I have never run into this! However, you’re correct – it’s happening to me as well, and I don’t have hardly any plugins installed (maybe 2, or 3)
I tend to do this, which is probably why I never ran into this issue.
<!-- This is not needed bc of x, y, and z
<script src="/some/file/name.js"></script>
-->
Also, pressing ctrl+/ multiple times will eventually comment the line out properly, but it then leaves stray slashes that have to be manually removed it you ever wish to uncomment that line.
// <script src="/some/file/name.js"></script> ctrl+/ x1
<!-- // <script src="/some/file/name.js"></script> --> ctrl+/ x2
// <script src="/some/file/name.js"></script> ctrl+/ x3
<!-- // <script src="/some/file/name.js"></script> --> ctrl+/ x4
// <script src="/some/file/name.js"></script> ctrl+/ x5
...