Hi. This is part of the modifications driven by the enhancement of the implementation of Actors. You may wan to check the Help > Capella Guide > Thematic Highlights > Enhancements of the implementation of Actors section.
The relation between Nodes and Behaviour Physical Components is not a containment, but a deployment (which is represented by the rounded corners of the BPC in the view you’ve shared). Since Capella 5 this distinction has been renforced.