Actually same issue as gabormicskei. Exactly month ago for example templatern.com was working but now it does not. Templateau.com is working now but I'm afraid that will also be reported as deceptive by Chrome & Firefox in near future.
The URLs work if disabling Safe browsing feature but that can generate additional security risk + management overhead to disable it temporarily from user computers and enabling it back after simulation.
Whitelisting the URLs in SafeBrowsing feature have not been working yet as wanted.
And also same as KubaBorkowski, now we are kind of forced to use english with customers and if end users do not work natively in english, that can be a barrier for not using this. For example the landing page where you can only edit header and body for a small amount of text. Indicator titles and other not customizable texts are in english and can cause confusion and suspicion in users if there are two languages mixed in it.