hmm... I tried to embed the code produced by ponsor on my Hashnode blog via widgets, and it didn't work... Could you check maybe that for your blog too?
I tried to embed the iframe directly in the blog, and got something like this, I think I can provide a code to make it run with hashnode, but since hashnode doesn't allow increasing the height of widget, it won't look that good, it would work as intended on a site you own and can change the code of