Any footnote in a tab is duplicated in each tab

Below, each of the 2 Tabs has one footnote. But both footnotes appear in both tabs.


Code for the example:
```
[ui-tabs position="top-left" active="0" theme="lite"]

[ui-tab title="Tab1"]
This tab introduces one footnote[^footNoteTab1].
[^footNoteTab1]: this footnote should appear only in Tab1.

Content of Tab1

[/ui-tab]

[ui-tab title="Tab2"]
This tab introduces one footnote[^footNoteTab2].
[^footNoteTab2]: this footnote should appear only in Tab2.

Content of Tab2

[/ui-tab]
[/ui-tabs]
```