"Options > AutoSuggest > Sort Order" seems to be broken

No matter what I do, changing this doesn't seem to have any effect.

 

When I press CTRL+SHIFT+L, the terms are always only shown in the order they appear in my source segment, not alphabetically (which is what I want, quite desperately), or otherwise.

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Options > AutoSuggest > Sort Order:

1. Sort by shortest suggestions first
2. Sort by longest suggestions first
3. Sort suggestions alphabetically

 

What am I doing wrong here?