@doragasu @lina
The developer explained in his Medium post how, after being snowed under with (legitimate) AI-generated security issues, he realised a significant refactoring would be needed. Further he also identified that his existing test coverage was insufficient so first had to update all of that.
He acknowledges his hastily updated tests have missed some lesser-used features, which are the ones some people are complaining about no longer working. Given the age of rsync, its extraordinarily large number of options, and the fact that it's written/maintained by one retired individual on a very part time basis, I think cutting some slack is the least we can do.
Or, y'know, submit a PR to fix the broken shit, rather than simply complaining!