When I do that, I can't turn the wah on at all with my feet. The pedal switch doesn't do anything. If I manually turn the wah on in HX edit then I can hear it's on, in the heel-down position, but the pedal doesn't change the position parameter. To confirm, these are now my settings:
Global Settings > Preferences
Exp/FS Tip: Set to "EXP 1"
Exp/FS Ring: Set to "FS8"
Global Settings > Footswitches
FS7 Function: Set to "AllBypass"
FS8 Function: Set to "TogglEXP"
Wah Block Preset Settings (same for all 3 mentioned above)
Wah: Conductor
Bypass: Footswitch 8
Position: EXP Pedal 1
EDIT: To add one more piece of info, I exported both the preset I bought and a preset that I built (before changing Bypass to footswitch 8. When I compared the code, the relevant difference I found was that the purchased preset had a "pedalstate" of 1 and the preset I built had a "pedalstate" of 2. I changed my built preset to have a pedalstate of 1 and reimported it and the wah worked. So, I can't figure out what setting in the Stomp XL or HX Edit corresponds to "pedalstate" in the preset code.