I was working through a site doing some updates and I needed to add so meta to a post, Working through the documentation on https://developer.wordpress.org/block-editor/tutorials/metabox/meta-block-1-intro/

I started running into some issues, it’s a pretty straightforward process with only a few steps that I had working, but then it broke the next time I was working on it, after way too much time and effort it appears to be a conflict between doing this and the Gutenberg plugin