Scan button doesn't react for WebDav

[Suncatcher]

Bug report

Scan button doesn't work for WebDav provider. Previously it worked. Provider is Stack.nl Address is https://XXXXX.stackstorage.com/remote.php/webdav/

Steps to reproduce - current behaviour

Enter address as usual

What is the expected behaviour

Additional remarks

Environment

Operating System: Win10 Browser vendor and version: Chromium 75 Storage Provider: WebDav

[Suncatcher]

It starts to fetch for a while but then again

[pelzvieh]

Here on Firefox 69.0.1 (Mac OS), the scan button does exactly nothing. Even with the full path of the keepass file given as URL, neither will the scan button work nor the file be available from the tusk drop down.