The Enforcement Rules of the Prison Act Article 53

If a prisoner’s parole is cancelled in accordance with Paragraph 1, Article 120 of the Act and if subsequent parole is granted for any remaining period of the parole in accordance with the second part of Paragraph 3, Article 120 of the Act, the Prison shall give notice to the probation execution authority by providing documents related to the probation period already executed under previous parole specified in the original execution writ for setoff against the parole and probation period.
中文原文 監獄行刑法施行細則第53條
依本法第一百二十條第一項規定,廢止受刑人之假釋,有本法第一百二十條第三項後段假釋尚未期滿之情形,嗣後再假釋時,監獄應將原執行指揮書所載前案假釋已執行保護管束日數相關文件,通知嗣後執行保護管束機關辦理折抵假釋及保護管束期間。

English translation for reference only; the Chinese text prevails. Not legal advice.