New thread on Swift forums covers issues with Structured Concurrency. It seems that even simple example might cause stack corruption which in turn might lead to serious vulnerabilities in apps built with it.
Swift Forums: Swift 5.5 has serious stack corruption bugs!
Developer:Monitor the thread, avoid the patterns mentioned there. Consider avoiding Structured Concurrency patterns until these issues are resolved.
QA engineer:Report any app crashes.
PM/DM:Postpone migrations to Structured Concurrency until later.