"Israel is supposed to begin withdrawing from the Philadelphi corridor on Saturday, the last day of the first phase, and complete it within eight days."
However, an anonymous "Israeli official" speaking to the Associated Press "said the army needed to remain in the so-called Philadelphi corridor, on the Gaza side of the border with Egypt".
If the occupying force remains in Gaza in any capacity, including in the corridor, it would be a "blatant violation" of the agreements for phase two of the ceasefire.
https://www.pbs.org/newshour/world/fragile-ceasefire-deal-in-jeopardy-as-israeli-official-says-army-wont-withdraw-from-strategic-gaza-corridor