Not very sure what is the problem here. I can not find other issues or questions regarding this error.
You can download the LAS file that produces the error here.
library(lidR)
las = readLAS("C:/Users/plot899error.las", filter = "-drop_class 7")
sensor = track_sensor(las, Roussel2020(pmin = 500), multi_pulse = T, thin_pulse_with_time=0)
las_dI = normalize_intensity(las, range_correction(sensor, Rs = 1300)) # Rs = average flight height
#> 3 coordinates detected in the sensor positions, parameter 'elevation' is not considered.
#> Error: Internal error: access to coordinates below 0 in the array. Please report this bug
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