SCNNode shadows from scene lighting not rendered

[genemecija]

Issue environment:
Device Model: iPhone 8
Xcode Version: 9.3.1
iOS Version: 11.3.1
Pod Version or Repo Commit: 1.5.1

Issue Details:
Shadows from scene lighting is not rendered/captured when the pod is installed. Both images below show an SCNBox with autoenablesDefaultLighting enabled. The bottom image is the SCNBox with no shadows after the pod is installed.