AutoFill/Suggestions not working on iframes within pages

Hi, 

I got an Issue with AutoFill, as well as even getting suggestions for Login fields on a page that is iframed on another page (eventhough both the hosting page's URL as well as the iframe URL are set as URLs for the Login-Object within 1PW...)

URL of the main page: https://wild-hair-berlin.de/ (my Hairdresser .. )
URL of the iFrame: https://www.time-globe-crs.de/crs-online-5054/ 

(Picture of the iFrame on the main page:

(need to click it once (for data privacy reasons...), to actually load the iframe and see the form...)
"Sometimes", Autofill will work, on Android, without having to open the iFrame's URL in a new tab, on Desktop, that is the only way to get Suggestions or autofill, though (open iFrame's sourcecode via the Chrome Option in the rightclick menu, remove "view-source:" from URL, is the usual way I make that happen, currently, as a work-around...) 

But it'd be really nice if 1PW could actually just detect the Login/Password fields and offer to fill them with the saved credentials?! :)