[UE4.14] Duplicating an actor and saving the UMAP causes the original actor to be deleted

[Marold57]

Game: Space Hulk Deathwing Enhanced Edition (Steam Version)
UE: 4.14.3
Describe the bug
Duplicating an actor and saving the UMap results in the original actor being deleted and only the duplicated actor being retained.

To Reproduce
Steps to reproduce the behaviour:

1. Open LVL_Chapter_04_Sanctuary_P1.umap
2. Duplicate BP_ST-LightColorMaster1 with alt + left drag and move it away.
3. Save UMAP with Stove.
4. Open UMAP again with Stove.
5. Original actor being deleted and only the duplicated actor being retained.

If I duplicate the duplicated actor again, all previous actors and the original actor are removed.
It looks like it happens with all duplicated Actors and is not Actor specific.

Assets
Are attached.

Operating system
Win 11.

Bug Report Stove Duplicated Actor deleted.zip