Problem with the magnetic plate

Hello, I have the following problem. I wanted to print ASA with my Snapmaker and heated the heating bed to 100°. The magnetic plate of the printing bed curved upwards and had an air bubble in the middle under the printing plate. Has anyone ever had this problem and what can I do about it? I heated up the magnetic plate and didn’t put it on until the end. Kind regards, Luke
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Did you try to turn around?

The idea is too simple to think of…I’ll test it

I printed Asa successfully at 85deg on stock plate with enclosure. Just cleaned it with alcohol. 100deg is a bit too much for it, plastic starts delaminating.