There have been many changes to that project in the curriculum, and we recently deployed changes. Some of those changes include re-ordering steps, deleting steps, and inserting new steps. So, if it looks like you have gaps in your progress, that would explain it.
I cannot think why it will not let you submit an answer for step 20. Your best bet to debug is probably to look in both the editor
Console, and the browser dev tools for more information.
Ok I figured out the reason I couldn’t complete step 20 is because I already submitted it. Is possible able to reset my progress on that assignment to step 19? Because it also says i completed steps 23-32 and I never did those ones yet.
Sorry, nevermind. I realized the steps were just re-ordered, so I did complete them, they just added new steps before them so it was confusing. Thank you!