apply_mapshaper_commands returns no response with -proj command

[ateucher]

library(rmapshaper)
library(readr)

geo <- read_file('https://geodata.ucdavis.edu/gadm/gadm4.1/json/gadm41_DEU_0.json') |> 
  ms_simplify(keep = 0.01)
#> Registered S3 method overwritten by 'jsonify':
#>   method     from    
#>   print.json jsonlite

apply_mapshaper_commands(geo, "-proj init=EPSG:25833 crs=EPSG:4326")
#> Warning: The command returned an empty response. Please check your inputs

^{Created on 2023-10-20 with reprex v2.0.2}

[ateucher]

Originally raised here.