Full Cure affected by dark weather penalty

Operating System: Windows Vista
ISP: Walmart
Type of Internet Connection: yes
Internet Connection Speed: 1Mbps
Date & Time: Jan-23-2023 15:00 PST
Frequency: Sometimes
Character Name: Pikohan
Race: Tarutaru
World: Bahamut
Main Job: WHM
Support Job: None
Area and Coordinates: Any area affected by dark weather
Party or Solo: Party
NPC Name: yes
Monster Name: yes
Steps:
1. Be in an area affected by dark weather.
2. Cast Full Cure on a severely injured player.
3. Find out that Full Cure does not fully heal the target if dark weather penalty procs.