Firefox backspace button doesn't work on GOS

Not sure if this is a GOS or Firefox issue.

Go to qwant.com, type something om the form, backspace doesn't work. Same result with ebay.com.

Using GrapheneOS, built-in keyboard, Firefox 150. Tried with and without ublock origin.

I think it has been a week or so since it started.

Anyone else got this issue?

Sorry if it's the wrong place to ask.

And thanks to the GOS devs, you have saved me from so many frustrations.

Edit: so far two people in comments seem to have similar problems so it's not just me.

Edit2: seems to only happen with some sites like qwant and ddg, and only with built-in GrapheneOS keyboard.

Curious if it happens on Android

Edit3: Duckduckgo now works, removed it from list