Unfortunately they seem to have straight up broken Claude Code either with this release in the backend or the new CC version. Errors about "can't modify thinking blocks" are bricking long-running sessions: https://github.com/anthropics/claude-code/issues?q=is%3Aissu...
I managed to get claude to create a recovery script to un-brick sessions, YMMV
https://gist.github.com/robertfw/993dbe8643c4fbdf12005dff2ec...