Adobe Reader DC - Incorrect Host when using WebDAV on non-standardized port

When opening a document from a WebDAV location (e.g. \\server@8081\XXXX) then Adobe warns me about opening this document because the host is not in the trusted list. The host should be "server", but Adobe interprets the non-standardized port (8081) from the file path "server@8081" as host.

Is that a known issue?

This is the path of the document when it is open in Adobe:

This is the warning when opening documents from this location:

We have tested this issue with different Versions of Adobe Reader, at least with Version

and also with Version 2300820421