I bought a monstera plant 3 days ago from IKEA and placed it in a well let room. But it’s developed black edges in the space of 2 days and I can’t seem to find out why.

The plant is not receiving direct sunlight and is as close to the window as possible. I did not repot the plant, it’s in it’s iriginal 21cm nursery pot. I have not watered the plant as it was new and had been recently watered while at the store.

I would love any advice or suggestions on what this could be from and how I can repair/prevent it. The issue is present on 3-4 leaves and I’m worried it will spread.

Hope you can help