getTitle stills retrun a title

[OdaiTu]

Version

Tell us which versions you are using:

• react-native-router-flux v4.?.? (v3 is not supported) yes 4.0.0-beta.28
• react-native v0.?.? 0.50.3

Expected behaviour

i expect to hide the title from my screen when navigate to it

Actual behaviour

the title still shows

Steps to reproduce

For non-obvious bugs, please fork this component, modify Example project to reproduce your issue and include link here.
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[Blapi]

Use the title or renderTitle property.

[mklb]

This issue still exists in 4.3.1.

Setting the title prop to null or an empty string does not work. The fallback title that is used seems to be set from the key prop.

However setting renderTitle={null} works.