1.23 prints some strange error

[Walter Alejandro Iglesias]

Dear groff users and developers,

I normally use OpenBSD in my desktop, which still comes with groff
1.22.4.  Today I booted an old laptop with Debian testing (Devuan to be
more precise) and, after updating it, I could finally test groff 1.23.

Lately, as I mentioned in this same list months ago, instead of the
conventional hyphenation method (my documents are in UTF-8 Spanish),
I've been using an application I wrote myself to generate a file with
entries like this:

  .hw a-ba-co
  .hw ár-bol
  .hw ca-ba-ña
  [...]

Also UTF-8 encoded.

I save those entries to a file called "hyphen.tr" and I source it from
my groff document:

  .mso hyphen.tr

1.23 output (under Debian) seems to be identical to 1.22 (under
OpenBSD), I see no issue in the PDF, both have the same words broken in
the same syllables, that's why I don't understand why 1.23 throws me
hundreds of lines of error like the following:

  troff:/home/morlock/Documents/Roquesor/Groff/tmac/hyphen.tr:8777: error: 
expected ordinary or special character, got an escaped '%'

I took a look to the hyphen.tr file and didn't find no '%' character.

Someone have any idea what happens here?


-- 
Walter