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Consider the following example:

{| class="mw-collapsible mw-collapsed"
|-
! Outer table
|-
|
{| class="mw-collapsible mw-collapsed"
|-
! Nested table
|-
| Should be collapsed initially
|}
|}

When the outer table is expanded, all rows of the nested table are expanded as well even though the nested table is set to be collapsed initially. The collapse caption of the inner table then reads as "Expand" (despite the table's content already being shown) and the first click on the label will only change the label to "Collapse".

Expected behaviour would be that only the header row of the nested table is shown when the outer table is expanded.