Layout not updating model

[Moky]

I am working on a Mac with SketchUp 2020.

I used to go back and forth between SketchUp and Layout, and simply updated the model references in Layout after I changed something in Sketchup. This was never an issue and worked great.

I updated to 2020 and this is not working reliably anymore. To relink the inserted drawing does not make a difference.
Sometimes it works, sometimes it does not, sometimes it takes a day.
I contacted SketchUp help, they told me there is an update, but the update did not change a thing.

Does anyone else have the problem?