I don't know of Token does the space of path auto.
I use [node:field-site-section-basic-page:root] the root of taxonomy .
I triple checked that there is no space in front the taxonomy term
I triple checked that there is no space in front of the the pattern
I triple checked value directly in database no space in front of the value.
the tax is selected by dropdown menu, so no user input.
I hope it gets resolved soon or something can do to fix it.