When I get a new skill point and use the pointer to open the skill tree via the “new point available” button in the lower right (cursor controlled by the right thumb stick), then move around the skill tree by not using the pointer (so this time with the left thumb stick, which encircles selected nodes), then pressing A does not put points into the node (it doesn’t do anything). In this case, I need to summon the cursor again. Afterwards I cannot close the window by pressing B. However, when I open the skill window via the circle menu and navigate to the skill tree via the shoulder buttons, then everything works as expected.
Early in the game, when I had only two skills, the skill tree view would even bug out in this case - it would show skill tree A and the tooltip of the skill, but as soon as I navigated around the skill (with the left thumb stick), the circles would not match the nodes and show tooltips of nodes from a different tree. I think they were from a non-specialized tree, but I’m not entirely sure.