"Select all" selects all of the image, not all of the active layer

[gyepi]

"Select all" used to select all of the active layer, and not all of the image. Now when I use "select all", GIMP 3.04 (on MacOS 15.5) selects all of the image, instead of all of the content of the layer. If I then press "shrink selection", the selection is getting shrinked from the entire image, and not only from the entire layer.

Is this the new normal behavior? How could I revert back to the old behavior (of "select all" selecting all of the active layer)?

Thanks!