Issue with String Suggestions in CommandComponent.Builder#suggestionProvider

[Syrent]

When trying to show suggestions for text inputs using SuggestionProvider.suggestingStrings, the suggestions don't appear as expected. The provided code snippet illustrates this issue, where the suggestions for arguments aren't displayed correctly. However, switching to a different method, SuggestionProvider#suggestionsFuture, solves this problem, as shown in the subsequent code snippet. Code Snippet (1):

            optional("leader", StringParser.stringParser()) {
                suggestionProvider(SuggestionProvider.suggestingStrings(Bukkit.getOnlinePlayers().map { it.name }))
            }

Result (1): Code Snippet (2):

            optional("leader", StringParser.stringParser()) {
                suggestionProvider { _, _ ->
                    CompletableFuture.completedFuture(Bukkit.getOnlinePlayers().map { Suggestion.suggestion(it.name) })
                }
            }

Result (2):

[Syrent]

After testing this with both required and optional arguments, it appears that the issue only occurs with optional arguments.

[jpenilla]

The server will have no players at command registration time.