Proof environnement has no clear end delimiter

[durandg12]

As you can see on the screeshot, there is no visual indication that a proof is finished. In the screenshot, the first paragraph is inside a proof environnement and the second is after the proof (so the proof ends with the first paragraph of the screenshot).

Is it possible to change this behavior, for example by adding a symbol akin to the \qed symbol of the amsthm package?

[durandg12]

This is for HTML rendering, in LaTeX rendering there is a QED symbol. But for documents intended to be rendered in both this is still a problem, now my pdf output has 2 QED symbols if I force one for the HTML output

[fradav]

This is an upstream bug (or missing feature) from quarto :
quarto-dev/quarto-cli#5036