This is why I love plan mode and switch to it as soon as I see the agent starting to deviate from the plan because it hit a wall. Gotta get back to aligning on design decisions, approach, reverting any debug code, etc. before progressing. (Damn, I have more instructions to add to AGENTS.md lol)
Although this was more of an issue when using opusplan as Sonnet loves to do this. I only use Opus now if using Claude.
I find this to be quite an interesting perspective change!
If I may try for a metaphor, then it's like our default perspective from the Earth is that we are the center of the universe, the other planets, Sun, and stars move around us, and we are stationary.
But, to zoom out, you can take a more objective view that everything is moving independently (ie, volatile). The baseline stability is a subjective perspective.
Although this was more of an issue when using opusplan as Sonnet loves to do this. I only use Opus now if using Claude.