[0.17.x] Blueprint Import String requires Mouse Move after import to update list

[darklich14]

The title says it all but here are brief reproduction instructions:

1. Copy a string to your clipboard to import it
2. Import but do not move mouse
3. Observe the library list does not update
4. Move the mouse
5. Observe the new blueprint in the library

[Loewchen]

I don't understand, after importing the blueprint, it is in my hand, it will not be added into any library until I put it there.