QtQuick Application text font disappear

[cb__]

Hi,
I am a QtQuick Developer, The application I developed has a small chance of the font disappearing after the computer is restarted.

I use the FontLoader component to load the fonts I want to use in the qml file.I want to know what causes this issue.
Here is a simple code example：

Window {
        id: mainWindow

        FontLoader {
            id: fontAliPuhuiRegular
            source:  "qrc:font/Alibaba-PuHuiTi-Regular.ttf"
        }

        Text {
            font {
                family: fontAliPuhuiMedium.name
                styleName: "Medium"
                pixelSize: 14
            }
            verticalAlignment: Text.AlignVCenter
            color: "#FFFFFF"
            text: qsTr("test")
        }
}

Qt Version: 5.15.2 + msvc
System: Windows 10