Especially with poetry, I always send suggested edits back to the author - if the rhthym is off, misspellings, etc. Then the poet has to make the changes.

For articles, if it's punctuation or spelling, normally that's not enough to contact the author.

For changing to active voice, improving clarity, re-arrangement of sentences or paragraphs for flow, etc., then I send back to the author with the edited version for their approval.

If you have a problem with an editor, it's important to contact them with your concerns and outline why - in most cases, editors are agreeable if your argument is sound, but if it's a question of word usage, proper punctuation and grammar and spelling, then a style guide is usually the final deciding factor.

Unfortunately, stubborn editors and writers both exist, and if the two should clash, disaster is sure to happen.

I had an article of mine printed once where two sentences were repeated. My manuscript wasn't at fault, but the typesetting person messed it up. Of course, it all looks like the author is a bad writer.