Collabora office opened in frame - CSP error saving files

Hi all,
as stated here https://forum.pydio.com/t/collabora-office-copy-paste-content-security-policy-error/4417 Collabora office cannot save documents due to a CSP error:
Refused to frame 'https://collabora.domain.tld:port/' because it violates the following Content Security Policy directive: "frame-src 'self' https://rating.collaboraonline.com/Welcome/welcome.html https://rating.collaboraonline.com/Rate/feedback.html blob:".
I’ve correctly set my Collabora server in plugins config, I think Cells must send a CSP like this (line added like this **line added**):
content-security-policy: default-src 'none'; frame-src 'self' **https://collabora.domain.tld:port** https://rating.collaboraonline.com/Welcome/welcome.html https://rating.collaboraonline.com/Rate/feedback.html blob: ; connect-src 'self' wss://cells.domain.tld; script-src 'unsafe-inline' 'self'; style-src 'self' 'unsafe-inline'; font-src 'self' data:; object-src 'self' blob:; img-src 'self' data: https://www.collaboraoffice.com/ cells.domain.tld:*; frame-ancestors cells.domain.tld:*

I think this should be considered a bug.

Any help?

Thank you

Looking at the other message, you are referring to the collabora internal download button right? Normally Cells is proxying requests to the collabora machine, but I guess in that case the download button is trying to reach the collabora domain directly ?

you are referring to the collabora internal download button right?

Yes

but I guess in that case the download button is trying to reach the collabora domain directly ?

Yes, it is.

Any possibility to change CSP?

Thank you

Is it so difficult to add such line to CSP on cells side?