Version 2.7.15 introduced breaking changes about getCurrentScope

[1593292349]

Version

2.7.15

Reproduction link

github.com

Steps to reproduce

1. npm install
   2.npm run start
   3.Execute the "getCurrentScope "method on the console

What is expected?

The getCurrentScope method returns undefined

What is actually happening?

The getCurrentScope method returns not undefined

---

The getCurrentScope method returns undefined in version 2.7.14

[1593292349]

I traced this line of code to affect this behavior，I'm not sure it's a bug。

[1593292349]

There is always an activeEffectScope，Causes watchEffect to bind to an incorrect instance and then be accidentally destroyed