Interresting, when comparing the source to the source for the Debian Repo version running behind Apache on one of my other servers I note this:
Not Working: <link href="/.woa/WebServerResources/img/sogo.ico?lm=1673014221" rel="shortcut icon" type="image/x-icon" /> Working: <link href="/SOGo.woa/WebServerResources/img/sogo.ico?lm=1636663461" rel="shortcut icon" type="image/x-icon" /> (This applies to all link href attributes) I suspect my rewrite instruction is the issue...