@kinkersnick We are also running into the same problem, but we are not using Kadence, only Stackable. This seems to be an issue with Yoast and either of the two block libraries, perhaps especially as more and more complex blocks are added.
We did try disabling SEO and Readability Analysis in Yoast, but that did not help.
Did you find a solution without having to resort to disabling Yoast?
I had a very similar issue on one site that I manage. I was able to take some time recently to dig in and debug a bit after keeping the version below v3.3.6 for a couple of months.
It ended up being calls to apply_filter('the_content', $content); in 3 Advanced Custom Fields block templates. I haven’t gone any further, and I determined that the the_content filter wasn’t needed in those areas for my purposes.
It seems that a filter from NextGen was added around this time. Hopefully, this could help narrow down the issue for you guys.
