DNS A record proxied stops loading site

When i switch from dns only to proxied my site stops working and I think it must be because of the internet provider but what do I have to do still proxy my A dns record as to stay safe.
Thank you in advance!
Images for reference:

What does “stops working” mean? Do you see any error message?

This is the error message:

Are you still experiencing the same error? I’m not able reproduce that error. Site loads. If the error continues to persist, make sure to see this Tutorial to resolve:

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