If you set the focused height of the chat to 20 pixels, open chat, run /toggledownfall (to get the "Toggled down fall" message), use tab completion (I discovered it with /give @a minecraft:stone<TAB>), then set the focused height back to max, then open chat, the tab completion results don't show up. If this is my own personal error, please comment below, if not please confirm.
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Ticket resolved as incomplete, because no answer in a reasonable amount of time (1+ year), if it still happens, please update the ticket.
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.