Apparently, terms with a common prefix are *not* connected by implicit "OR"

[Jorge P. de Morais Neto]

Hi.  The NOTMUCH-SEARCH-TERMS man page says:

    Each term in the query will be implicitly connected by a logical AND
    if no explicit operator is provided (except that terms with a common
    prefix will be implicitly combined with OR).

However, in practice I get different results:
    $ notmuch count '(to:pontodosconcursos.com.br OR to:jorge+cp+concurso at disroot.org)'
    66
    $ notmuch count '(to:pontodosconcursos.com.br to:jorge+cp+concurso at disroot.org)'
    0

I have other examples of this.  I currently use notmuch 0.29.1 privately
backported to Debian buster according to the Debian Wiki [procedure][],
but I already got this problem in earlier notmuch releases, including
the official Debian buster package.  What gives?

[procedure]: https://wiki.debian.org/SimpleBackportCreation

My workarund is to always explicit the "OR" operator, as in:
    (to:concurso OR to:dominandoti OR to:cebraspe OR to:gleyson131 OR to:quadrix.org.br OR to:cathedranet.com.br OR from:cathedranet.com.br OR from:quadrix.org.br OR from:gleyson131 OR from:cebraspe OR from:dominandoti OR from:concurso OR is:lists/itaconcursos)

If the OR operator was indeed implicit, the query above would be
shorter.

Regards
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