/usr/share/gimp/2.0/dynamics/ is in gimp-data 2.8.22-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gimp/2.0/dynamics/Basic/
/usr/share/gimp/2.0/dynamics/Basic-Dynamics.gdyn
/usr/share/gimp/2.0/dynamics/Basic/Basic-Simple.gdyn
/usr/share/gimp/2.0/dynamics/Basic/Dynamics-Random.gdyn
/usr/share/gimp/2.0/dynamics/Basic/Negative-Size-Pressure.gdyn
/usr/share/gimp/2.0/dynamics/Basic/Pen-Generic.gdyn
/usr/share/gimp/2.0/dynamics/Basic/Pencil-Generic.gdyn
/usr/share/gimp/2.0/dynamics/Basic/Pencil-Shader.gdyn
/usr/share/gimp/2.0/dynamics/Basic/Pressure-Opacity.gdyn
/usr/share/gimp/2.0/dynamics/Color-From-Gradient.gdyn
/usr/share/gimp/2.0/dynamics/Dynamics-Off.gdyn
/usr/share/gimp/2.0/dynamics/FX/
/usr/share/gimp/2.0/dynamics/FX/Confetti.gdyn
/usr/share/gimp/2.0/dynamics/FX/Perspective.gdyn
/usr/share/gimp/2.0/dynamics/FX/Speed_Size_Opacity.gdyn
/usr/share/gimp/2.0/dynamics/Fade-Tapering.gdyn
/usr/share/gimp/2.0/dynamics/Random-Color.gdyn
/usr/share/gimp/2.0/dynamics/Tilt-Angle.gdyn
/usr/share/gimp/2.0/dynamics/Track-Direction.gdyn
/usr/share/gimp/2.0/dynamics/Velocity-Tapering.gdyn