Steps

1: Start translating en:List of bridges in Seattle or en:List_of_bridges_and_tunnels_in_New_York_City using CX (You can set the target language to any languages, this is reproducible in Japanese as well).
2: Click Add Translation (Choose Any MT services, or choose direct copy from original).

Actual Results

Automatic Translation Failed is displayed on the upper right corner. And the console will display error indicating that:

jQuery.Deferred exception: Cannot read property 'shallowCloneFromRange' of null TypeError: Cannot read property 'shallowCloneFromRange' of null

Please reproduce this by yourself, so that you can grab the whole error log.

Expected Results

After click add translation, the table should be displayed as a translated one on the right column, or the original version if I choose "copy from original".

Comments

This is different than T216583, which a large table is rejected by server due to the lange length; nor T215225, since there is no template based table in the articles listed above. In this case, a small two role table can cause Automatic Translation Failed, even when you choose direct copy from original.