Some items do not recover GP when they are gathered in Shadowbringer zones

Gathering in shadowbringer zones does not regenerate GP as it does in previous expansions.

Example: You could be a miner gathering in Lakeland but no GP gets recovered every time you press gather.

BUT... In let's say Ruby Sea, you will regain GP.

I'm not yet sure if this is applicable to all items and gathering locations.

Is it because you're missing with your swing? You have to successfully gather to get the 5 GP.