[Update] it is the apostrophe in the name not the length. So I guess the bug is there is no error message given it just does not save the file.
I am moving rules from one hub to another and using export. I got to a group of rules that would not export. It turned out that is was the rule name causing it. Apparently there is a limit to the length. The main issue was, it gave no indication of why it would not export. You can just click through the buttons and nothing happens. Nothing was put in the log either.
The rule below can not be exported.