TransitionablePortal: onClose is called even on button click when controlled

[lainermeister]

Bug Report

Steps

In this sandbox, click Open Portal, then click Close Portal. Check the console.
https://codesandbox.io/s/happy-drake-yly34?file=/example.js

Expected Result

One callback of onClose triggered

CB triggered: Button closed 

Actual Result

Two callbacks of onClose triggered

CB triggered: Button closed 
CB triggered: Portal closed 

Version

"semantic-ui-react": "1.2.1"

Testcase

https://codesandbox.io/s/happy-drake-yly34?file=/example.js

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[srid12]

I would like to solve it