As seen in this thread, crossed line (I don't know if its the proper term in English) don't wrap properly: https://hero.handmade.network/forums/code-discussion/t/2094/p/10846.
Also how do you do crossed line ? There is no button to do it in the toolbox.
You'd normally call that 'strike out'. In this case it's not a parser feature as you can see when you examine the resulting html. It's a bit of a misfeature of the font. We'll pick this up in March. If we decide to keep the font in question, we'll replace such patterns with appropriately marked up struck out text or otherwise force it to wrap properly.
Thanks for the report :)