Yes as lostdog says, it’s a new feature that writes plans in plan mode to ~/.claude/plans. And it thinks it needs to continue the same plan that it started.

So you either need to be very explicit about starting a NEW plan if you want to do more than one plan in a session, or close and start a new session between plans.

Hopefully this new feature will get less buggy. Previously the plan was only in context and not written to disk.