The bug
You can put a chest on world border near a chest outside world border to create double chest and take all that is inside chest that was off limits before.
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Confirmed, maybe works as intended.

And... how should this be fixed in your opinion? It's pretty much not possible.

It can be fixed 2 ways.
1) Add a check for world border to the function that converts chest -> double chest. It should not lag much.
2) Add is_inside_world_border parameter and check for it to be same for both chest before converting. This parameter is set on generation and should be changed with border change (that could lag a bit if you change border significantly but you can use it for other blocks if needed)

Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases. If this has been done, we can reopen the issue.
Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. We will reopen it as soon as the requested information has been delivered.

Yes it still work in 1.8.2-pre.

Possible fixes: Don't combine to double chest or (more complicated) make all slots that are outside the world border appear empty and make inaccessible (like in gamemode 3).

Confirmed for 1.10.

Confirmed for 1.13.1.

Confirmed in 1.15.2 and 20w22a.
Can confirm in 21w03a.
Can confirm in 21w05b.
Can confirm in 21w07a.
Video attached.
Can confirm in 1.16.5 and 21w08b.