Special layer values disappear when re-opening the file

I’m using the latest non-beta version of Glyphs3 on Ventura 13.2.1.

I’m working in a three axis MM-file (weight, width and angle) in which I set up special layers for specific letters, that are supposed to have shorter ascenders in specific instances.
In Glyphs itself and in the exported files it works as intended.

My problem is that every time I close and re-open the file, all the values in my special layers are gone.

Unfortunately the special layer tutorial only uses an one axis example, so I’m not sure if I’m doing something wrong or not.

Or to put it into images:
Before closing
Screenshot 2023-07-17 at 11.16.20

After closing
Screenshot 2023-07-17 at 10.41.20

Any help will be appreciated. Thank you!

Can you check the file type in Font Info > Other > File Version. Set it to “version 3”.

It was not …
The layers keep their value when re-opened now.

Thank you!