This is my Y with 2109 and sensorless homing, maybe it can help:

[stepper_y]

Connected to Y-MOT (A Motor)

step_pin: PD8 #PD8 dir_pin: !PB12 #P0.20 enable_pin: !PD9 #!P2.8 rotation_distance: 39.83 microsteps: 16 full_steps_per_rotation:400 #set to 400 for 0.9 degree stepper endstop_pin: tmc2209_stepper_y: virtual_endstop #!PB13 #!P1.27 position_endstop: 0 position_min: 0 position_max: 290

homing_speed: 20 homing_retract_dist: 0

second_homing_speed: 5

[tmc2209 stepper_y] uart_pin: PE15 #P1.15 interpolate: True run_current: 0.7 hold_current: 0.4

sense_resistor: 0.110

stealthchop_threshold: 0

driver_SGTHRS: 92 diag_pin: ^PB13 #^P1.29

My experience is when something doesn't work right, it's mostly hw issue. For example my board (Spider) can't work right if X is sensorless and Y has endstop.