The great big "I'm using WIX/SomeWebsiteMaking Tool and I don't know how to fix my embed" thread

Yeah wordpress.org hosted blogs can have issues and block people from doing certain things

self hosted wordpress blogs often work better as you can do what you want

As to why it behaves in the preview but not on live I don’t know.

Ok thank you for the assistance, you suggest to self host the blog on my own to fix this thing?

there might be other solutions for a wordpress.com hosted blog. But a self host will give you full control