[Underwhelp]

If snagging is not listed in the fishing profile you are running, or set to false under the task you are on I think it is coded to remove it. I would need to check at home to be sure as I am working. But I been playing with ffxiv_task_fish.lua and I am sure it checks the profile, and will remove if set to false, not sure the behavior if not entered at all.

Update : It will remove snagging if not set in your profile, or set to false, as soon as you try to fish.