Suppressing backtrace warnings

With 6.1, how can I get backtraces without warnings polluting output from every call?

I've been setting

SWIFT_BACKTRACE="enable=tty,output-to=stderr"

Now (in Swift 6.1 from Xcode 16.3) I constantly get

swift runtime: backtrace-on-crash is not supported 
for privileged executables

I tried adding ,warnings=suppressed from [1], but get an additional warning

swift runtime: unknown backtracing setting 'warnings'

Thanks!

[1] https://github.com/swiftlang/swift/blob/main/docs/Backtracing.rst

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