Update, the texture is actively being used in-game, in the boss menu.

Traces of the P3R FeMC Mod have been found in Persona5: The Phantom X files A texture containing a screenshot of the mod's pause menu, specifically an older, pinker version of the menu, has been found, containing Chinese text translating to "Menu background color optimization" This suggests Black Wings or Atlus referenced or intended to reference the FeMC project for its UI colors in the P3P x P5X collaboration event. Can further verify the source is the FeMC Reload Project as the Kotone model matches the older model and broken animations from an older 2025 version of the project. The menu also contained "Commu" rather than "Social Links", suggesting the screenshot comes from an employee's own modded copy of P3R as Japanese showcases of the mod are typically taken down.