relative fragment links are broken

[eyaler]

p5.js version

n/a

What is your operating system?

Windows

Web browser and version

firefox

Actual Behavior

a fragment link in html eg:

<a href="#frag">jump to frag</a>
<div id="frag">hi!</div>

are broken and result in:
"Not found"
when running before saving, or:
{"message":"Asset does not exist"}
when running after saving

Expected Behavior

jump to fragment as expected in HTML

Steps to reproduce

see above snippet or here:
https://editor.p5js.org/eyaler/sketches/Lo8oYAYsR