Masks, Groups and Adjacent layers not visible

[SOWatson]

ArmorPaint 1.0 alpha-5807ad3, Windows

Issue description:
As the title implies, adding mask layers, Paths and curves don't show in the layer window however they are added as their effects are visible on model and shown in the edit window. The arrow on the main layer that indicates there is additional layers is visible but when clicked to open; nothing is shown.
Steps to reproduce:
Unknown, bug appeared when project was open however it was the first instillation of program and the first start of the application. Opening a new project doesn't have the bug and the bug persists only within the save of the bugged project.

[enkvadrat]

I have the same problem on Linux using the latest git version. It used to work in the previous version I used from jan 2026. I was trying to follow: https://www.youtube.com/watch?v=MgcvTjYyeIQ&t=14s but I think it is not up to date

[enkvadrat]

Ah I did not read the full issue description... Yes it is only in one specific project that it does not work in.
Here it is:
https://nextcloud.snps.se/s/iSL7WXnyiBfgze9