500 class errors - 404 Not Found cloudflare-lb

Hello,
I’m trying to configure 500 class error page.
The page is validated and added successfully but No preview is available.
CF only returns " 404 Not Found. cloudflare-lb"

Should I ignore this message?
I will run some tests to make sure the page is displayed correctly when a 5XX error is returned.
thanks in advance for your help.

Hello,
There was indeed an issue with a release, which has been rolled back now.
You should not see this error anymore when previewing the custom error page.

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