Undo does not undo some changes

[nus-pe-bot]

To reproduce, Delete a phone associated with a schedule Then archive a few schedules

Undo till the point in which the deleted phone is back The schedule does not reflect that the phone is back and still remains empty at the original scheduled time

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_{[original: nus-cs2103-AY1920S1/pe-interim#701]}

[zhixianggg]

Team's Response

Unable to reproduce the bug as issue is unclear. Not sure what does archive a few schedules mean.

Duplicate status (if any):

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