Dollar signs in environment variable values not preserved by LbEnv

It seems that LbEnv (tested version 464) does not preserve environment variable values.

$ env TEST='a$USER' bash --norc -c "env | grep TEST; . /cvmfs/lhcb.cern.ch/lib/LbEnv-unstable --quiet; env | grep TEST"
TEST=a$USER
TEST=armatev

$ env -i TEST='a$$' bash --norc -c "env | grep TEST; . /cvmfs/lhcb.cern.ch/lib/LbEnv-unstable --quiet; env | grep TEST"
TEST=a$$
TEST=a$