I find it really really strange that Mask clearance defaults to the same value as Copper clearance.
This means, even without a filled zone, that a copper trace near an SMD pad can get exposed by the tiniest registration error (mask offset wrt copper).
I'd suggest at the very least to make Mask clearance default to /half/ of Copper clearance.
Yes, it is the same thing.
I find it really really strange that Mask clearance defaults to the same value as Copper clearance.
This means, even without a filled zone, that a copper trace near an SMD pad can get exposed by the tiniest registration error (mask offset wrt copper).
I'd suggest at the very least to make Mask clearance default to /half/ of Copper clearance.