Is it possible that a ganglion cyst removal on the wrist damaged or ruptured a tendon?

Yes: On the dorsum of the wrist the ganglion usually arises from the wrist joint and extends upward between the extensor tendons, so the tendons could possibly injured at the time of excision. On the volar side of the wrist the ganglion commonly arises from the s-l, or s-t joints and courses by or around the flexor carpi radialis which could be injured at the time of surgical excision.