hst:showcontextpath on hst:mount not picked up

hst:showcontextpath is not picked up when set on a mountpoint.
Reproduction path:

• Go to the console
• Navigate to 'hst:hst -> hst:hosts -> dev-localhost -> localhost -> hst:root'
• Add the boolean property 'hst:showcontextpath' with value 'false'
• Navigate to the site and look at the source

Expected result:
links are not prefixed with '/site'

Actual result:
links are prefixed with '/site'

When the property is set on a hst:virtualhost node it works as exepected.