SwiftKey inserting text inside emoji when using cursor (might cause crashes)

SwiftKey inserts text into emoji when using cursor (3d touch on spacebar).

Reproduction steps:

1. Open message in iMessage -> Insert 🎉🎉🎉

2. Move cursor by 3d touch betwen second and third emoji -> insert D letter there (like this "🎉🎉D🎉" )

3. Text is inserted improperly inside emoji, on sending - app crashes

This issue occurs everytime for SwiftKey with above reproduction route, doesn't occur for native Apple keyboard.