Why is Israel still restricting aid to Gaza?

41 organisations operating on the ground in Gaza call on the Government of Israel to uphold its commitments under the ceasefire agreement and international law and let humanitarian aid flow freely.
Since the ceasefire began, Israeli authorities have continued to arbitrarily reject shipments of life-saving assistance into Gaza, while a restrictive new INGO registration process further delays urgent humanitarian work.

Between 10 and 21 October, 99 requests by international NGOs to deliver aid into Gaza were rejected, while six requests submitted by the UN agencies were denied. Aid denied by Israeli authorities includes tents and tarpaulins, blankets, mattresses, food and nutrition supplies, hygiene kits, sanitation materials, assistive devices, and children’s clothing, all of which should be unrestricted during the ceasefire.

https://reliefweb.int/report/occupied-palestinian-territory/mounting-alarm-israeli-authorities-reject-ngo-applications-transport-life-saving-aid-gaza-0

I am discussing the current situation you are referring to December 2023?

Not sure what relevance your post has to the question of why Israel is continuing to restrict aid into Gaza in contravention of both the terms of the ceasefire and it’s obligations under International Law

And now they have started bombing again, what a surprise

“Israel is continuing to block vital supplies to Gaza despite agreeing to allow aid in as part of the ceasefire agreement, aid agencies warn.
Blocked supplies include food, medicines, tents, and blankets and also materials desperately needed to start rebuilding water treatment and sewage systems.
Oxfam’s policy lead for the occupied Palestinian territories, Bushra Khalidi, said, “ People are calling this a ceasefire, but it doesn’t feel like peace. It feels like it’s an intermission between tragedies.”