Slowly switching screens in Tabs component will not mount them

[SourceCipher]

Version

Tell us which versions you are using:

• react-native-router-flux: ^4.0.0-beta.31
• react-native: ^0.55.3

Expected behaviour

When slowly changing the scenes in tab component by sliding left or right, the scene will mount

Actual behaviour

I have 2 scenes within the tab and if I slowly slide to the right to switch the scenes, the next scene even when it switches, will not be mounted properly. As seen in this video, when I switch to the next scene the header icon color will change, but it will not do it if I do it slowly and it will trigger the component only if I move a bit again.

Steps to reproduce

See the video -> Here

[aksonov]

Please try to reproduce it with Example project and latest version 4.0.0-beta.40. Feel free to open if the issue still exists