Refs are set to null instead of undefined when components are destroyed in vue v2.7.0-alpha.5 #12554
Description
Version
2.7.0-alpha.5
Reproduction link
Steps to reproduce
Press the toggle button to cycle the ref
Working case with v2.6.14: https://codepen.io/pdanpdan/pen/QWQVXmr
Failing case with v2.7.0-alpha.5: https://codepen.io/pdanpdan/pen/JjpaQOP
What is expected?
this.$refs.test to be an element or undefined
What is actually happening?
this.$refs.test is null