Vue-select: Setting initial value via value prop locks the selection

[roennow]

Describe the bug
in 3.. you can no longer set the selection via the value prop without vue-select locking its selection to that initial value. That is fine if you put a vue/vuex data object and update that but if you set the value prop as a string (ex. your data comes from PHP)

To Reproduce
https://codepen.io/roennow/pen/yLOVbwE
Try to select something different than foo

Expected behavior
https://codepen.io/roennow/pen/bGpBWJr
When you select something different than foo it actually does it

Desktop:

• OS: macOS Catalina (10.15.6)
• Browser Firefox
• Version 78.0.2

[snsxn]

I can confirm that.
For me, back to version 3.9.4 and it's working again

[bmoex]

Just verified and it seems that the changes from #1210 caused the error.