AE 23.3 crashes when opening my old project, specifically due to the Paint effect when I created those brushstrokes with my Wacom tablet. The project runs smoothly until I enable that effect, then instant crash. Brushstrokes created with a mouse or device other than a Wacom tablet work fine. This happens on new projects as well. Brushstrokes created with my mouse work fine. As soon as I create one with my Wacom tablet it crashes.
This bug has been confirmed by other users as well: https://creativecow.net/forums/thread/after-effects-2023-wacom-brush-tool-crashes-2/