Android 12: As of targetSdkVersion 31, the toast messages are clipped

Recently my smartphone (Google Pixel 3) got an update from Android 11 to 12. Afterwards, I wanted to adapt my app Sensor Recording accordingly. So I made some changes in "build.gradle":

compileSdkVersion 31    // 30 before
defaultConfig {
    targetSdkVersion 31    // 30 before
    …
}
dependencies {
    implementation 'androidx.appcompat:appcompat:1.4.0'         // 1.3.1 before
    …
}

Everything was working correctly. However, I detected that the Toast messages were different now: They include a useless icon, and – even worse – the text message was truncated.

Before – with SdkVersion 30

And after – with SdkVersion 31

Both Toast are generated with the same code. But in the new version, the important parts of the text are missing. How can I get back the old Toast behaviour?