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The debug showed lots of different promises being leaked:

CONTEXT: transferIsSecret(resource:cluster-services/nginx-ingress-controller-internal[kubernetes:<http://rbac.authorization.k8s.io/v1:RoleBinding|rbac.authorization.k8s.io/v1:RoleBinding>], roleRef, [object Object])

STACK_TRACE:

Error: 

    at Object.debuggablePromise (/app/services/node_modules/@pulumi/pulumi/runtime/debuggable.js:41:75)

    at Object.transferProperties (/app/services/node_modules/@pulumi/pulumi/runtime/rpc.js:64:322)

    at /app/services/node_modules/@pulumi/pulumi/runtime/resource.js:224:33

    at Generator.next (<anonymous>)

    at /app/services/node_modules/@pulumi/pulumi/runtime/resource.js:21:71

    at new Promise (<anonymous>)

    at __awaiter (/app/services/node_modules/@pulumi/pulumi/runtime/resource.js:17:12)

    at prepareResource (/app/services/node_modules/@pulumi/pulumi/runtime/resource.js:201:12)

    at Object.registerResource (/app/services/node_modules/@pulumi/pulumi/runtime/resource.js:110:24)

    at new Resource (/app/services/node_modules/@pulumi/pulumi/resource.js:204:24)

This did happen to me once when I lost connectivity to app.pulumi.com, so it might be a network issue. Can you find any exceptions that aren't about leaked promises? They may lead you closer to the real cause.