Inputs for "implemented" and "closed prefixes" can be broken if user perform too early interaction

[XFFA.IR Bot]

Steps to reproduce:

1. Open ACP.
2. Go to "Nodes", open page for adding forum with "Suggestions" type (/admin.php?forums/add&parent_node_id=0&forum_type_id=suggestion).
3. Interact with "Implemented prefixes" or "Closed prefixes" input.
4. Enable required prefixes below for node.
5. Try interact again with input.

Expected result: input should suggest freshly enabled prefixes without any issues.
Real result: "No results found" without any text entering...

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