Level Sequences in Level Instances

Workaround is to specify Binding Overrides on the LevelSequenceActor through its Details panel as such (while editing the LI).

A sample project, LevelInstanceTest, is attached based on the following steps:

1. Create World Partition level (TestMap)

2. Create a Level Sequence Actor and Level Sequence interpolating transform of an actor on WP level

3. Create additional level LevelInstanceTest

4. Add LevelInstance to a WP level

5. Observe error: 

"Level Instance LevelInstanceTest (/Game/Developers/vitaliipryvalov/Map/TestMap) is not using external actors /Game/Developers/vitaliipryvalov/Map/LevelInstanceTest.LevelInstanceTest "

6. Move Level Sequence Actor and Actor which is interpolated by it to a Level Instance

7. Enabling OFPA in project settings

8. Restarting UE 

9. On LevelInstanceTest level turning on the 'Use External Actors' from World Settings

10. On opening WP map no errors can be seen 

11. Starting PIE: level sequence from Level Instance doesn't affect designated actors anymore.

12. Starting PIE/Streaming Level Instance in and out shows no error in log at all: no errors on bindings, nothing