Piece of plastic inside UPVC window frame? What is it?

19 Dec 2017
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United Kingdom
Hi all

One of my UPVC windows was not shutting properly and I found this piece of plastic inside the frame which the window was being caught on. I removed it and the window now shuts properly. What is it, is it necessary? I've not noticed this on previous house windows before

They are approx 1 year old (new build house).

I tried to google it but it didnt come up with anything

Thanks in advance

Pictures attached:

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