When using the Slack integration for Asana, the /asana create dialog allows you to set a project to add the task to. However, 100% of the time, the dialog fails when typing the name of a project, with the error: No items matched [search string] even though there are indeed matches.
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Other than forcing users to type their search query in a second time, I am aware of no workaround. I have tried disconnecting and reconnecting the Slack integration, but the problem persists.