Flickering when doing color grading

Running the latest shotcut version that can be downloaded. When applying the color grade filter and dragging the control points for shadow midtones and highlights I get preview flickering. Color changes are correctly shown but the flickering is disturbing. Last time I did an edit earlier this year I didn’t notice this.

I changed the display method to OpenGL and automatic / Software - but in each mode there is some flickering although it differs a bit in appearance.

This is the way it is unfortunately and unlikely to be fixed.