Patch for two issues.
I'm afraid it's usually impossible to help without more details! If you run in to any problems please file an issue following all the guidelines.
I will be happy to report the issue using your link. But I will say that the issue is as simple as this: Containers do not work with persistent objects. They do not create the contained object.
EDIT: Looking further into your bug report it would be impossible for me to follow your guidelines. My project is massive with over 30,000 actions. I can not submit an example that uses minimal events.
As stated before, Persistent Objs with containers do not spawn in their contained obj when you re-enter the room they are in.
EDIT 2: I have created a tiny new project that showcases the issue. This is great as this tells me that this is solely a container issue and not some code in my project. I will upload this example. Recreating this issue lets me know MANY construct users will run into this problem with containers if used with persistent objects.
github.com/Scirra/Construct-3-bugs/issues/6444
I also have this problem with my game now. Persistent object's container object is destroyed upon re entering the layout. I even opened a previous version of my game that for sure didn't have the issue on the new stable release and the problem is there too so it's not my code messing with it.
I’ve submitted an example file for them. It looks like they are looking into it. Hopefully we see a fix soon. This all happened right as we hired a company to playtest and QA our game. Imagine if this had happened during the release month, oof. I think after the update that fixes this we may hold off on updating construct until after base release.