css3 animation compile wrong in SFC with 'scoped'

[yangxin9003]

System Info

OS: macOS 11.2.1
[email protected]
node v14.16.0
Package manager: npm

Reproduction

source code:

<style scoped>
@keyframes player {
    from {
        transform: scale(1);
        background-color: rgba(255, 255, 255, 0.25);
    }
    to {
        transform: scale(2);
        background-color: rgba(255, 255, 255, 0);
    }
}
</style>

result:

[jonaskuske]

See vuejs/core#3304, already has a PR: vuejs/core#3308