Incident: Slack Apps displaying "We can't fully display this message"

Starting on August 27, 2025 at around 4:41 PM PDT until 6:31 PM PDT on August 28, 2025, some apps/integrations were showing a "Can't fully display message" error in Slack for users attempting to select options within a dropdown menu element.A backend change was made to the structure of the "external_select" block in Slack Block Kit, causing improper value conversions, leading to the errors. We reverted the change, resolving the issue for all affected users and integrations.