Simulink Dashboard blocks invisible (no mask image)

I created my model on MATLAB R2021b featuring a Horizontal Slider, a Dashboard Scope, and a Vertical Gauge. The three blocks worked well for a while. Suddenly, after reopening the file from one day to the next, these three blocks dissapeared (the rest of the model is ok and runs without errors).

However, if I open the same model with MATLAB R2022a, the blocks actually show up:

for compatibility with the rest of my working team, I am constraint to keep using R2021b. There should be a workaround for this, right?. It seems to be a software bug rather than a local issue since the same thing happened on some of my coleague's pcs as well (R2021b of course).

[Rich Conlan]

Can you share the model?

[Rabindranath Raul]

I have same issue. All my scope are invisible in dasboard.