Slot props in render function is not sync

[peterhpchen]

Version

2.6.8

Reproduction link

https://codepen.io/peterhpchen/pen/MxrRre?editors=1010

Steps to reproduce

• First number picker is declared in container-two
• Second number picker is declared by footer slot
• Change number picker
• The value of the first number picker would be changed, but the value of the second number picker would not be changed
• If add slot content in container-two(js code line: 59-61), the value of the second number picker will be changed

What is expected?

There are two situations:

• If this code is correct(without line:59-61): Both number value should be changed when picker changed.
• If this code is wrong(should add line:59-61): It should have error message or even not render slot.

What is actually happening?

• The value of the second number picker should be changed
  Or
• Error message should be shown or even not render slot.