Mailto: in some websites doesn't open e-mail client


I came on a site of a hospital to make some remarks:ënten/geef-uw-mening/suggestie-of-opmerking?steID=1&catID=479
The link ( opens a new tab with blank searching page.
No e-mail client will start.

In Chrome this link opens a same blank page, but also starts the e-mail client.
Firefox and Edge (after permission) start the e-mail client as expected.

Is this an issue of Brave and/or of this particular site.
One (more?) other site with a link mailto: I tested the e-mail client opened.

The e-mail client I use is Thunderbird.

Brave 0.18.14
rev ad92d02
Muon 4.3.6
libchromiumcontent 60.0.3112.78
Node.js 7.9.0
Update Channel dev
OS Platform Microsoft Windows
OS Release 10.0.15063
OS Architecture x64

Luc Boumans