I noticed in the Qspice revision history that an update was made to the behavioral NE555 UVLO (Under Voltage Lock Out)
06/04/2024 Increased the behavioral NE555 UVLO
When examining the .subckt file, it can be observed that the UVLO is set at 2.5V for the RS flip-flop. Possibly, Mike saw your request and updated the behavioral model.
