Side menu navigation resets tab stacks but tab navigation does not

[WhatsThatItsPat]

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[x] bug report
[ ] feature request
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Current behavior:

If you push a schedule detail page onto the stack, use the "speakers" tab to navigate away, and push a speaker detail page onto the stack there as well, you can tab back and forth and each tab stack will keep its history. If you click the corresponding schedule and speaker buttons in the side menu, the history is cleared and you end up at the root page for each tab.

This is more obvious when the split pane is open.

Expected behavior:

I'm not 100% sure on this, and it might not really be a bug, but the links in the side menu look like they should be another way to do the same thing as the bottom tabs. In which case, clicking on them once should navigate without changing the history, and clicking a second time when already on a tab should take you back to the root.