Confusing v-deep deprecation message

[rchl]

Version

2.7.10

Reproduction link

https://codesandbox.io/s/vue

Steps to reproduce

The message:

https://github.com/vuejs/vue/blob/0f1d7ae29a1d785a2979dc640aa5f5cecf83cf85/packages/compiler-sfc/src/stylePlugins/scoped.ts#L132-L133

also triggers in this case:

<style lang="scss" scoped>
:deep {
  h1 {
    content: '';
  }
}
</style>

Notice how there is no ::v-deep here and the warning still triggers.

What is expected?

The warning mentions :deep also.

What is actually happening?

The warning only mentions ::v-deep.

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(The link to reproduction is a dummy because the link in the bug report for Vue 2 points at the Vue 3 template and so I don't have time to look for the Vue 2 template)