Jekyll 4/kramdown stops processing markdown after Bandcamp iframe embed

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1

I’m seeing an issue where Jekyll seems to entirely stop Markdown processing after it hits a Bandcamp embed iframe in a Markdown document. Here’s the iframe, using code directly copied from Bandcamp’s share widget:

<iframe style="border: 0; width: 100%; height: 120px;" src="https://bandcamp.com/EmbeddedPlayer/album=4094980965/size=large/bgcol=ffffff/linkcol=0687f5/tracklist=false/artwork=small/track=3976760464/transparent=true/" seamless><a href="https://bubblegumoctopus.bandcamp.com/album/big-battles-ii">Big Battles II by Bubblegum Octopus</a></iframe><p>

I’d seen a couple of comments about Jekyll having similar issues with invalid HTML in the iframe syntax so I tried adjust it to a version that validates, but I’m still seeing the same problem.

<iframe style="border: 0; width: 100%; height: 120px;" src="https://bandcamp.com/EmbeddedPlayer/album=4094980965/size=large/bgcol=ffffff/linkcol=0687f5/tracklist=false/artwork=small/track=3976760464/transparent=true/"></iframe><p>

I’m using Jekyll 4.4.1 with kramdown. I’m able to repro if I scaffold a new site with default options and copy my post in, so I don’t think it’s related to any plugins or configuration I’m using.

2

I believe I’ve figured it out. It’s the <p> that comes at the end; if I remove the <p> after </iframe>, it works. I’m still not sure why this is happening though!