Operating system: Windows 10
Graphics card: GTX1080
Short description of error
A linked collection disappears after a reload even when it is being used by the particle system
Exact steps for others to reproduce the error
Download same files from T62587
Go ahead and pick the "Instances" collection from the particle setting's drop down menu.
Delete the Empty that is instancing the collection in the scene
Save and re-load
The collection is gone and the particle system no longer displays it.