localParameters for an HstComponent are not correct in case variants are configured

For example the following configuration on a hst component:

hst:parameternames =

{"foo","foo"}

hst:parametervalues =

{"bar","lux"}

hst:parameternameprefixes =

{"","professional"}

results in local parameters map

foo --> bar or foo --> lux

instead of

foo --> bar
professional'\uFFFF'foo --> lux