Referer problem in webmin with cloudmin installation

OS type and version Debian 11
Webmin version 2.021

I have problem with “Open link” from Cloudmin installation with webmin 2.021, to SlaveDNS instalation on virtual machine with webmin 2.021 too. Error in web developer tools in firefox is “The resource “” was blocked due to mismatched MIME type (“text/html”) (X -Content-Type-Options: nosniff).” .
If I open error description in firefox, I navigated to page with this "Warning! Webmin has detected that the program was linked to from an unknown URL, which appears to be outside the Webmin server. This may be an attempt to trick your server into executing a dangerous command.

Make sure your browser is configured to send referrer information so that it can be verified by Webmin. "

My question is why need check browser configuration, when “Open Link” from the same Cloudmin machine to another virtual machine with Virtualmin installation with webmin 2.021 works correctly. referers_none=1 is set on both virtual machines (SlaveDNS and Virtualmin). There is an error somewhere in the SlaveDNS webmin configuration, or in some cache, I just don’t know where to look for it.

Sorry: No “Open link”, but “Open webmin” is wrong. “Open link” not exist, only “Link to webmin”, and this work correctly. Wrong is only “Open webmin”.

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