I have a post with XML code blocks in it and the content is not properly escaped.
I think this is styling from your code blocks which you should strip before putting in the feed (and you’ll still need to properly encode)
Post https://blog.bmannconsulting.com/3mnnwcdentk2c
Feed validator https://validator.w3.org/feed/check.cgi?url=https%3A%2F%2Fblog.bmannconsulting.com%2Frss