The turbulence and tip vortices behind an airliner are a familiar hazard for smaller aircraft when near an airport. But a lightweight glider seems to have not suffered from this, when its tail was actually struck by an Airbus A 320 at altitude. Page 8 of the accident report mentions only the choc brutal felt by the glider's occupants, and nothing about being blown around like a leaf.
At the time of collision, the airliner was descending through 8600 feet at a true airspeed of 280 knots, if my French can be trusted. The glider was flying at 53 knots, almost perpendicular to the airliner's path. So the glider would have encountered the airliner's wake for a good fraction of a second. Its long wings would be quite sensitive to turbulence.
Compared to the Airbus's high thrust at takeoff, or slow speed and high drag at landing, would its turbulence be less hazardous here, at low thrust and high speed?
https://www.skybrary.aero/index.php/Wake_Vortex_Turbulence#Accidents_and_Incidents mentions some "en-route" turbulence, but only from one aircraft trailing another. So maybe a cross-track incident is much milder.