Some wellfomed tables are not parsed correctly

Reproduction steps

1. Create a page with syntax markdown.
2. Add the following below in the page.
3. save and view the page.

| a | b  |
| - |- |
| c | d  |

Expected

A table with two cells is displayed.

Actual

The page displays:

| a | b  | | - |- | | c | d  |

Observations

It seems mandatory to have three dashes to form a valid column for the current parser.
The table definition below is parsed and rendered correctly, and adding more dashes works as well

|  a  | b   |
| --- | --- |
|  c  | d   |