As reported on the German-language Wikipedia's feedback page, the VisualEditor breaks the table layout if a row is removed from a table where a column spans several rows via rowspan.
Take the following example (test page):
{| class="wikitable"
! rowspan="3" |Big span
| rowspan="3" |Big span
|{{Version |p |60.5}} Smallest
|-
|{{Version |p |60.6}} Smaller
|-
|{{Version |p |60.7}} Small
|}This results in a table like this:
Now, use the VisualEditor to remove the first row (diff) and publish changes. The result is the following source code
{| class="wikitable"
|-
! rowspan="2" |Big span
| rowspan="2" |Big span|{{Version|p|60.6}} Smaller
|-
|{{Version |p |60.7}} Small
|}which is rendered as
The correct source code is (diff)
{| class="wikitable"
|-
! rowspan="2" |Big span
| rowspan="2" |Big span
|{{Version|p|60.6}} Smaller
|-
|{{Version |p |60.7}} Small
|}which renders as
