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[Liang2580]

Assume that the client's cookie is
Hm_lvt_ff7f6fcad4e6116760e7b632f9614dc2=1583134761; Hm_lvt_137ae1af30761db81edff2e16f0bf0f8=1583134761; Hm_lpvt_ff7f6fcad4e6116760e7b632f9614dc2=1583309076 Hm_lpvt_137ae1af30761db81edff2e16f0bf0f8=<img src=x onerror=alert(1)>

Then get the following:
{"Hm_lvt_ff7f6fcad4e6116760e7b632f9614dc2":"1583134761","onerror":"alert(1)>","Hm_lvt_137ae1af30761db81edff2e16f0bf0f8":"1583134761","Hm_lpvt_137ae1af30761db81edff2e16f0bf0f8":"<img","Hm_lpvt_ff7f6fcad4e6116760e7b632f9614dc2":"1583309076","src":"x"}

This confused me. I also plan to modify some of your code logic