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Summary
SUMMARY: Features "Add feather flag implementation"
Purpose of change
As mentioned in #45961 JSON's FEATHER flag is deprecated and doesn't do anything.
Describe the solution
Monsters with FEATHER flag can now occasionally lose feathers when moving and when attacked.
Describe alternatives you've considered
Delete this flag at all.
Testing
Spawning birds with this flag and attack them. Also see how them running away and lose feathers.
Additional context