Phone Entity in capture block accepts text

In my chat setup flow I ask for the phone number of the respondent. I use a capture block for that. Within this block I ad the default phone entity as created by Voiceflow.

It was my understanding that this phone entity was trainded/configured to recognize the most common Phone number chat input.

When I run my flow after training and type as a request for the phone number a random text (no numbers) it is accepted. Of course only phone number should be accepted. What goed wrong (in my understanding).