Bug Prefab Workflow Issues - Overrides are back, Undo broken, Scene hierarchy weird

Just submitted a bug report;
(Case 1197599) [Prefabs] Various issues and bugs around Prefab workflow

with at least six different Prefab issues from a single project.
This is how a prefab should look:


Somehow, I managed to have Disconnected Prefabs in the scene despite as I understood them not being a thing anymore:


Note that the box is blue but the texts aren't.


Selecting "Overrides" shows that it is for whatever reason disconnected.


On another object, clicking "Overrides" throws a ton of NullReferenceExceptions.

 

Creating a prefab and then undoing changes both hierarchy and prefab state of the object and its parent. (the jump is when I press Ctrl + Z). Also, the prefab creation is not undone (this might be by design, not sure?)


Creating a prefab out of the parent and undoing also does not undo prefab creation (again, by design?).


Clicking on "Open" on one of those disconnected prefabs is really weird, as it seems to open the original parent (?) in Prefab Isolation Mode but of course no way to actually apply changes to the object I just pressed Open on (as it is disconnected).


Going into Prefab Isolation mode throws numerous exceptions from "UnityEditor.SceneManagement.StageUtility.IsGameObjectRenderedByCamera".
(this last one actually seems to come from the URP - "com.unity.render-pipelines.core/Runtime/Volume/VolumeManager.cs:425")

 

@LeonhardP and also @runevision - I think these are relevant to you. Thanks

 

Additionally, Prefab Isolation for Canvas objects is back to being entirely unusable as nothing is rendered at all.

 

I found that the prefab issue is related to Universal RP 7.1.5. It disappeared when I went back to 7.1.2.

 

@LeonhardP thanks! I think the biggest blocker by far is that Isolation Mode just downright doesn't work right now as described above... this is a huge workflow issue as you can imagine.

 

@LeonhardP I followed up on the original bug report (1197599), since we found out that the issue with Prefab Isolation can be worked around by disabling the URP Post-Processing Volume prior to entering isolation mode. Thought it's better to ping you here as well since I didn't get a reply on the original bug report yet.