After showing/hiding mose cursor can't focus on widget

Unreal Engine Programming & Scripting Blueprint
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#1

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I found this problem in bug list at 4.8, but in 4.9.1 i still having problem with this. May be i’m doing something wrong?
P.S. If i deleting Input mode, then nothing’s changing

#2

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with this script UI loose focus

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with this works perfect(one problem cursor not hidden)

How fix this?