Prusaslicer - printer doesn't change to 2nd bed temperature

I use Prusaslicer as my main slicer, and I’ve encountered a bit of a strange error with it: I’ll have two different bed temperatures set for the first and all subsequent layers, but the printer stays at the first one. I’m printing from gcode generated by the slicer via USB. It will properly change to my second extruder temperature, though. Does anyone know a fix for this? Thanks!