Approachable Concurrency flag = YES corrupts actor asyc function parameter

[mylaluna]

Description

Please find more details in
https://forums.swift.org/t/approachable-concurrency-flag-yes-corrupts-actor-asyc-function-parameters/80633

Reproduction

Sample project to reproduce the issue is attached to Feedback ID: FB18365972

Expected behavior

The parameters passed into actor function should keep with their original values.

Environment

Xcode Version 26.0 beta (17A5241e)
Swift 6
MacOS Tahoe 26.0 Beta (25A5295e)

Additional information

No response

[DougGregor]

This was fixed by #81615, which is available in Xcode 26 beta 2