I stumbled upon an odd behaviour of layers in QGIS 3.4 brought from PostGIS. The first layers I brought to the project are always editable together when clicking the Toggle Edit-button, but some of the other layers are editable only when separately selected. These layers have been brought to the project afterwards. I have tested this in 3.4.0 and 3.4.2. with Windows (as QGS and QGZ). Also when the same project was used by others in their own environment, all the layers had to be separately changed to editable. This causes problems because there are relations between the tables and you have to know what tables should be editable. How can I make all the layers editable at once?
Edit: Noticed that when the same layers are brought to a new project, they have to be clicked editable one at a time. I have used Project Generator tool to create the layers and some of the relations between the layers.