Cannot start PXE on custom (specific) port

[grasshopper47]

docker run                    \
  --rm                        \
  --workdir "$PWD"            \
  -e AZTEC_NODE_URL="$2"      \
  -v $HOME:$HOME              \
  -v cache:/cache             \
  -p $1:$1                    \
  aztecprotocol/aztec:latest  \
  start --pxe --port $1

Have used this command successfully until version 0.47.1 to launch a PXE attached to $2, running on port $1

Since version 0.48.0, it complains:

Moreover, it seems that there is something wrong altogether in parsing the port parameter, as -p isn't recognized at all, and --port is parsed as NaN