This is a regression
//UE4/Release-4.26.2 CL15973114 Binary - Did not reproduced
//UE4/Release-4.27.1 CL17735300 Binary - Reproduced
//UE5/Release-5.0-EarlyAccess CL16682836 Binary - Reproduced
Holding down Shift prevents F from being detected as an input. Doesn't appear to affect any other key bindings.
Similar to [Link Removed]
No input is detected. "Hello" is not printed to the output nor is "F".
The text from the Print String node would be displayed in the viewport
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-135782 in the post.