When using the behavior add-on template, the /loot_tables/gameplay/fishing.json file does not seem to be read by the game. No matter what changes are made to the file, fishing seems to keep the default behavior.
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Cleaning up old tickets: This ticket has not been updated recently (1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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Unfortunately, this bug is actually a thing. Confirmed to affect 1.0.6.0.