Kirby in Iframe

Hello all,

I use the Kirby backend often from a iframe on top of the frontend, so I can edit the page directly.
This worked well up to Kirby 3.9.

In newer versions the panel will suddenly not load anymore because of the following:

Refused to frame 'https://[domainname].nl/' because an ancestor violates the following Content Security Policy directive: "frame-ancestors 'none'".

Is that something I can change somewhere, or is this a bug?

Lokking forward hearing your thoughts! Thanks in advance.

Excellent. Thank you!!