Delete in 'Commit Message' text field affects text in diff window

I've just updated to IntelliJ IDEA 2016.3 EAP and it seems like 'Commit Message' field in diff-viewer of 'Commit Changes' window is broken. When I type text there it behaves correctly. But when I am trying to remove some characters nothing happens in 'Commit Message' window. Characters are removed from file opened in diff-viewer.

IntelliJ IDEA 2016.3 EAP
Build #IU-163.5644.15, built on October 5, 2016
IntelliJ IDEA EAP User
Expiration date: November 4, 2016
JRE: 1.8.0_112-release-b408 x86_64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
OS: OSX 10.11.6 (15G1004)