Issues with LanguageSource on 2018.3

Hi, i have Dialogue System plugin and I2 in a project. Need to implement instant changes in I2prefab when modify DS DialogueEntry fields and vice versa.

I ve tried to add new Term via AddTerm() or update existing, then:
source.UpdateDictionary();
EditorUtility.SetDirty(source);
AssetDatabase.SaveAssets();

but I2prefab's inspector view havent changed. What is a correct way to catch up changes in terms and repaint a prefab inspector?

And LocalizationManager.Sources[] adds and hands out a new Language source instance sometimes, makes a Source[0] to null.
I have one inspector window opened, one I2Languages prefab in resources folder, empty scene. But sometimes got exception that object (sources[0]) has been destroyed, or got a nullref/agrument null exception.
LocalizationManager.UpdateSources() didnt help.

Windows 10. 2018.3.0b11 unity, 2.8.7.f1 version of plugin and 2.0.3.1 DS