Two spaces after punctuation and SpellCap issues

To reproduce:

$ vim -u NONE
:syntax on
:set spell cpo+=J

to let vim know I always put two spaces after a sentence. However,
if I enter text like

Call Bob re. the faucet.

or

Take Main St. the whole way down.

vim's syntax highlighting flags "the" in SpellCap as if it's
expecting the "." to mark the end of the sentence and require "the"
to be capitalized (as "z=" provides as its top suggestion).

My understanding is that the cpo+=J should require two spaces for it
to be considered a sentence, but it looks like it's ignoring this
flag when engaging the SpellCap group (which seems to think it's at
the end of a sentence).

Am I missing something or is this possibly a bug?

Thanks,

-tim



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