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`TypeError: value.map is not a function` when performing update all related records

See original GitHub issue

Bug description

Receive TypeError: value.map is not a function when performing update all related records.

Related to issue #7085

How to reproduce

export const completeWorkerRequest = async ({ id, comment }) => {
  requireAuth({ role: ADMIN_ROLE })

  const existing = await db.workerRequest.findUnique({ where: { id } })

  return db.workerRequest.update({
    where: { id },
    data: {
      comment,
      status: { connect: { id: 0 } },
      updatedBy: context.currentUser.email,
      actions: {
        create: {
          actor: context.currentUser.email,
          message: 'marked request as completed',
          actionType: { connect: { id: 11 } },
        },
      },
     // the following lines causes the above error
      workers: {
        updateMany: {
          data: {
            projectId: existing.projectId,
          },
        },
      },
    },
  })
}

Expected behavior

Able to update all related records with no error.

Prisma information

schema.prisma other models are omitted for brevity.

datasource DS {
  provider = "postgresql"
  url      = env("DATABASE_URL")
}

generator client {
  provider        = "prisma-client-js"
  binaryTargets   = "native"
  previewFeatures = ["orderByRelation"]
}

model Worker {
  id               Int              @id @default(autoincrement())
  name             String           @unique
  employeeNumber   String?
  socsoNumber      String?
  mobilePhone      String?
  remark           String?
  birthdate        DateTime?
  arrivalDate      DateTime?
  isManager        WorkerManager?   @relation("isManager")
  skills           Skill[]
  permits          Permit[]
  passports        Passport[]
  cidbGreenCards   CidbGreenCard[]
  workerRequests   WorkerRequest[]
  workerReleases   WorkerRelease[]
  cidbCompetencies CidbCompetency[]
  nationality      Country          @relation(fields: [nationalityId], references: [id])
  nationalityId    Int
  jobTitle         JobTitle         @relation(fields: [jobTitleId], references: [id])
  jobTitleId       Int
  project          Project?         @relation(fields: [projectId], references: [id])
  projectId        Int?
  employer         Employer         @relation(fields: [employerId], references: [id])
  employerId       Int
  manager          WorkerManager    @relation(fields: [managerId], references: [id])
  managerId        Int
  status           WorkerStatus     @relation(fields: [statusId], references: [id])
  statusId         Int
  beneficiary      Beneficiary?     @relation(fields: [beneficiaryId], references: [id])
  beneficiaryId    Int?
  createdBy        String
  createdAt        DateTime         @default(now())
  updatedBy        String
  updatedAt        DateTime         @updatedAt
}

model WorkerRequest {
  id              Int                   @id @default(autoincrement())
  startDate       DateTime
  endDate         DateTime?
  transferDate    DateTime?
  description     String?
  comment         String?
  jobTitle        JobTitle              @relation(fields: [jobTitleId], references: [id])
  jobTitleId      Int
  workersQuantity Int
  project         Project               @relation(fields: [projectId], references: [id])
  projectId       Int
  status          WorkerRequestStatus   @relation(fields: [statusId], references: [id])
  statusId        Int                   @default(1)
  skills          Skill[]
  workers         Worker[]
  actions         WorkerRequestAction[]
  createdBy       String
  createdAt       DateTime              @default(now())
  updatedBy       String
  updatedAt       DateTime              @updatedAt
  links           WorkerMovementLink[]
}

Environment & setup

OS: Windows Subsystem for Linux (Ubuntu-20.04)
Database: PostgreSQL
Node.js version: v14.16.1

Prisma Version

prisma               : 2.22.1
@prisma/client       : 2.22.1
Current platform     : debian-openssl-1.1.x
Query Engine         : query-engine 60cc71d884972ab4e897f0277c4b84383dddaf6c (at node_modules/@prisma/engines/query-engine-debian-openssl-1.1.x)
Migration Engine     : migration-engine-cli 60cc71d884972ab4e897f0277c4b84383dddaf6c (at node_modules/@prisma/engines/migration-engine-debian-openssl-1.1.x)
Introspection Engine : introspection-core 60cc71d884972ab4e897f0277c4b84383dddaf6c (at node_modules/@prisma/engines/introspection-engine-debian-openssl-1.1.x)
Format Binary        : prisma-fmt 60cc71d884972ab4e897f0277c4b84383dddaf6c (at node_modules/@prisma/engines/prisma-fmt-debian-openssl-1.1.x)
Default Engines Hash : 60cc71d884972ab4e897f0277c4b84383dddaf6c
Studio               : 0.379.0