X_ERROR_RETRY_INVALID
Means
error retry classification is unknown or already claimed
Typical cause
registerErrorRetry() given a kind that is not terminal, retryable or retry-after, or a second, different classification for one code. Core's own codes are closed to reclassification: an app that could call X_DRAINING terminal would stop the retry a rolling restart depends on
Fix
x errors list --json — then registerErrorRetry({ <CODE>: 'retryable' }) with one of terminal, retryable, retry-after