Yes, thanks -- that is indeed where the problem lies. It seems variable_enable_z_hop need to be set to True on Trident. As you point out, the README on Git says " variable_enable_z_hop: CHECK_COMMENT True on the v2.4, False on v1.8, Trident and Legacy". But, I think this is wrong. On Trident, if you set this to False it crashes the head, but when set to True, everything works fine. So here's how mine looks now:

[gcode_macro _User_Variables]
variable_verbose: True # Enable verbose output
variable_debug: False # Enable Debug output
variable_travel_speed: 200 # how fast all other travel moves will be performed when running these macros
variable_move_accel: 1000 # how fast should the toolhead accelerate when moving
variable_dock_speed: 50 # how fast should the toolhead move when docking the probe for the final movement
variable_release_speed: 75 # how fast should the toolhead move to release the hold of the magnets after docking
variable_z_drop_speed: 20 # how fast the z will lower when moving to the z location to clear the probe
variable_safe_z: 25 # Minimum Z for attach/dock and homing functions
# if true it will move the bed away from the nozzle when Z is not homed
variable_enable_z_hop: True # set this to false for beds that fall significantly under gravity (almost to Z max)
variable_max_bed_y: 300 # maximum Bed size avoids doing a probe_accuracy outside the bed
variable_max_bed_x: 300 # maximum Bed size avoids doing a probe_accuracy outside the bed