Just as a follow up, the scene outliner now remembers its state if play is pressed, however I did notice that if you launch a map or re-open a map that all the folders expand and do not respect the state when the map was saved. I tested this in 4.1.1 and 4.2.0 pre-release.
Have you tried this in 4.9 or the 4.10 preview? Does this occur in either of these engine versions? If so, what steps did you take to reproduce it on your end?
I have not been able to reproduce this in 4.9 or 4.10, Are there any specific steps I can take to reproduce this on my end in these builds? Does this occur in a clean, blank project with no additional content or is it limited to one project?
Folder expansion specifically. The error you are seeing with converting to 4.9, if you believe this to be a bug, should have a separate answerhub post so we can assist you more in depth.
Post with converting to 4.9 already exists on answerhub but I can`t find this). Ok, , I will try again with 4.9 and reproduce those warning massege while saving my map with other name.
This still happens in version 4.19, here is a screenshot / animated gif of my steps, on a new project with the default starter map - https://screenpresso.com/=96FVf
Thank you for the information provided. It appears that this issue happens when playing with multiple players. I have written up a new report for this issue. I have provided a link to the public tracker below. Please feel free to use the link provided for future updates.
Also here on 5.1 and 5.2:
All folders and parent objects expand at runtime.
The bad thing is after qutiting gamemode the parent objects stay expanded (while folders nicely collapse).