Test Failure: ` DiagnosticsManager Test Suite` - `llvm diagnosticsStyle` failed on `Linux - nightly main`

[award999]

Failure logs

  1) DiagnosticsManager Test Suite
       Parse diagnostics
         Parse from task output
           llvm diagnosticsStyle
             Parses related information:
     AssertionError [ERR_ASSERTION]: undefined == 1
      at Context.<anonymous> (test/integration-tests/DiagnosticsManager.test.ts:345:32)
      at processImmediate (node:internal/timers:485:21)

Link to failed run: GitHub Actions Link

Additional context
Started 5 days ago due to change in latest nightly Swift toolchains

Related test failures
N/A