How an airfoil behaves at the stall point depends on a lot of things. Often it's hard to apply "rules of thumb" to them. If they stall with a sudden and large separation bubble that produces a sudden very high drag then the model can often appear to suddenly fall out of the sky. This can often be compounded by a loss of lift if the airfoil is of the type that has a sharp peak rather than a nice rounded lift curve at the stall.

Stek, as an experiment you could try adding a turbulator strip to the top surface of your aerobatic wing to see if you can soften the stall and help avoid that sudden drop. Often a turbulator can be used to reduce the severity of the separation bubble size. But be sure to try it out 3 mistakes high before commiting to a landing....

That link to the NACA report has some great info in it to study. You'll see how some airfoils have a nice rounded or even "flat" lift curve at the stall point while others look like Mt Everest in their sharpness at the stall.

I'm sorry if I had given the impression that airfoils NEVER suffer a loss of lift at the stall. They idea was that when stalled that they don't just stop lifting all together. The point was supposed to be that when our models "stall" that they are suffering from a loss of lift due to a reduction, but not total failure, in lift along with a sudden increase in drag which slows the model down and further reduces the lift.