I regularly have this happen:

1. Ask Claude to fix something

2. It fails to fix the issue

3. I tell it that the fix didn’t work

4. It reverts its failed fix and tells me everything is working now.

This is like finding a decapitated body, trying to bring it back to life by smooshing the severed head against the neck, realizing that didn’t bring them back to life, dropping the head back on the ground, and saying, “There; I’ve saved them now.”

Gosh, can't we get back to Sonnet 3.5 or whichever was the version around a year ago? It worked so well for me.