Using keyboard shortcuts to navigate between replies causes topic to be "stuck"

When moving down a topic using J, it gets to a point where you can’t navigate any further using the key. Even if I try to move up (K) and move down, I still cannot move below that specific reply.

I believe this reply is the last of the loaded replies and the keyboard shortcuts doesn’t trigger the loading of the next batch of replies?

Also, scrolling up/down when encountering this does not work. Oddly enough, you can’t load the next batch even if you try and scroll down - no loading spinner, nothing, even the bottom reply isn’t the last one.

I can reproduce this consistently on an internal site and it seems to happen when the height of the last topic fits nicely within the screen.

Going to put a pri-medium on this for the team to look at.

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