Fenced code blocks with new lines doesn't work

This is not recognized as a code block:
```
cd /var/www/

# Test
echo "Test"
```

This works fine:
```
cd /var/www/
# Test
echo "Test"
```

It doesn't help if you put white space in the empty line. But once you add non-whitespace it seems to work fine (turns grey).

Windows 10, NB 12.3.