(EN): After upgrading to macOS 15+, the system contains two incompatible versions of the PingFang (苹方) font: 1. A system-provided version (/System/Library/Fonts/PingFang.ttc) 2. A user-installed version via Font Book (located in ~/Library/Fonts or /Library/Fonts) When a user installs or removes the PingFang font via Font Book after the app starts, font resolution may switch, causing garbled text in newly opened windows or views. This issue did not occur in macOS 13 or 14, and seems specific to how macOS 15+ handles system and user font overlays.