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I can confirm that this is fixed in build 2059. Thanks!
This is still taking place in build 2057.
I can confirm that this is fixed in build 2039. Thanks!
The bug seems to be fixed as of build 2036. Thanks!
Ah, you're right. Goto Anything in the second pane does work. Thanks! In fact, it looks like you can open the buffer an arbitrary number of times, by moving all the open buffers into the first pane, and opening again in the second. (0_0)

Likewise, it would be great if there were a quicker or more obvious way to do it, but this gets me most of the way there.