How do I separate an island into two islands?

I am trying to improve the edits on Garip Island in Turkey.
The island actually consists of two islands - one very small island, and another larger island.
(I visited the islands and did GPX traces recently).

On OpenStreetMap it appears as a single landmass.
On commercial mapping services it is correctly identified as two separate land masses.

I have tried to split it into two using the web editor, as shown here:

But when I view the islands days later, I still see a single landmass:

What am I doing wrong please?

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