[O] horizontal rules in table confuse org-table-iterate

[Hendrik Tews]

Hi,

with Emacs 26.1 and org-mode version 9.2
(release_9.2-148-g7d638d @ ~/src/org-mode/lisp/),

org-table-iterate does not update tables for me. In the following
table:

| 1 | 1 |
| 2 | 2 |
|---+---|
| 3 | 4 |
#+TBLFM: $2=$1+1::@3$1=vsum(@1..@2)

M-x org-table-iterate does not update the table, although I was
expecting a 2 in cell @1$2. If I delete the horizontal rule, the
table is updated. Am I doing something wrong?

Thanks,

Hendrik