Heya!

Steps to reproduce from emacs -Q:

    C-x C-f repro.rst
    C-x C-+ + [+…]                  ; until e.g. "+6"
    - words
    M-x visual-wrap-prefix-mode

Expectation: no visual change.
Observation: the "- " prefix is propertized with…

    There are text properties here:
      display              (min-width ((6 . width)))
      face                 rst-block
      fontified            t
      wrap-prefix          (space :align-to (6 . width))

… which makes the text look like this:

    -     words

I believe the cause lies in visual-wrap--content-prefix; empirically the
attached patch shows good results on this reproducer, but I landed on it
more by trial-and-error than by rational analysis, so it may be
incorrect or suboptimal (e.g. there may be better text-scale or
string-width APIs to use).

Thanks for your time (& for the love & care visual-wrap has been
receiving lately).