California Code, Code of Civil Procedure - CCP § 996.240

(a) The original bond remains in full force and effect for all liabilities incurred before, and for acts, omissions, or causes existing or which arose before, the new bond became effective.

(b) The sureties on the original bond are not liable for any act, default, or misconduct of the principal or other breach of the condition of the bond that occurs after or for any liabilities on the bond that arise after, the new bond becomes effective.