>According to well-established protocols, if the damage to Shenzhou-20 cannot be repaired aboard Tiangong, Shenzhou-21 will be used to transport the previous crew back to Earth.
>In the event both vessels are damaged beyond repair, a backup Shenzhou spacecraft would be sent from the Jiuquan Satellite Launch Centre in northwest China.
>A backup Long March-2F rocket and Shenzhou spacecraft are always on standby at the launch centre in the event of an in-orbit emergency.
https://www.reuters.com/business/media-telecom/chinas-shenzhou-20-return-mission-delayed-due-space-debris-impact-2025-11-05/

finally some clarity on the issue instead of endless wild speculation