It should resume from middle of the long page as it was doing in the old version.
Goes to the beginning of the long page.
Also happens when you turn your screen off and back on.
Just thought to mention also occurs in the weekly preview/dev build.
(seems to go to start of the page/beginning).
This actually applies to regular viewers too, such as LTR. It's more obvious when the page is bigger than the viewport (e.g. using fill height).
Likely related: #3013
Maybe it's recreating the activity/layout?
If it helps, it seems to have creeped in between r2112 and r2152.
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Also happens when you turn your screen off and back on.