Repro:

Steps outlined in attached repro video. Repro project attached

Create a Light Probe group
Duplicate Light Probe Group
Move the second group to the side to show both side-by-side
Select the first group and enter probe edit mode
Select and delete the second group from the Hierarchy

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Observed:

Merged probe positions are not updated when other Light Probe Groups are deleted during probe edit mode. This leaves some phantom probe cells being draw in the world, which can be highly confusing to the user.

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Notes:

On delete, maybe we can check whether it is a Light Probe Group which has been deleted, and if this is the case, update all probe positions? Either this, or update merged probe positions when Light Probe Group components are selected, not just Edited.