Probably the best example I can think of is Diane Duane reworking her Wizards series to make it modern-day, but there are others, including owners of a literary estate altering books left to them to make them compatible with current standards.
What do you think? Does it matter if it’s the original author or an inheritor?
Sometimes it seems to pass unnoticed. Many years ago, I was discussing details of Asimov’s “Foundation” online with another reader, and we found that I kept quoting passages he could not verify. In the end we realised that some time in the early 1980s, “Second Foundation” was stealthily edited, modifying a couple of data that were inconsistent with the two previous volumes and removing or altering a few phrases. While I had the original edition, he had the revised one and therefore was unable to find my quotes!