Invalid permissions on Lambda function error

[RTiNo1]

I tried to use this plugin to split resources.
There are several functions in the project, but I want to create stacks for the one specific function - generic, which has a lot of resources
Both with default split or custom stacks-map I'm getting 500 internal server error, caused by "Execution failed due to configuration error: Invalid permissions on Lambda function".
Resources that are not grouped work, only those in stacks do not.

I will be very grateful for any advice where the error may be.

serverless.yml

service: "service-name"
frameworkVersion: "=1.61.2"

plugins:
  - serverless-webpack
  - serverless-offline
  - serverless-aws-alias
  - serverless-prune-plugin
  - serverless-plugin-split-stacks

custom:
  currentStage: ${opt:stage, self:provider.stage}
  webpack:
    webpackConfig: webpack.config.js
    includeModules: true
    packager: yarn
    excludeFiles: src/**/*.test.js
    keepOutputDirectory: true
  authorizer:
    name: authorizer
    type: request
    identitySource: method.request.header.Cookie
    resultTtlInSeconds: 0
  environmentVariables:
    ALLOWED_ORIGINS:
      Fn::Join:
        - " "
        - ${file(./config/${self:custom.currentStage}.yml):environment.API_ORIGINS}
    NODE_ENV: ${file(./config/${self:custom.currentStage}.yml):environment.NODE_ENV}
  splitStacks:
    nestedStackCount: 50
    perFunction: false
    perType: false
    perGroupFunction: true
    custom: stacks-map.js

provider:
  name: aws
  runtime: nodejs12.x
  apiName: ${file(./config/${self:custom.currentStage}.yml):stackName}
  region: eu-west-1
  stage: dev
  account_id: ${file(./config/${self:custom.currentStage}.yml):provider.account_id}
  timeout: 20
  versionFunctions: ${file(./config/${self:custom.currentStage}.yml):provider.versionFunctions}
  role: ${file(./config/${self:custom.currentStage}.yml):provider.create_role_arn}
  vpc: ${file(./config/${self:custom.currentStage}.yml):provider.vpc}

functions:
  ping:
    handler: src/functions/alert/ping.ping
    role: ${file(./config/${self:custom.currentStage}.yml):provider.execution_role_arn}
    environment: ${self:custom.environmentVariables}
    events:
      - http:
          path: alert/ping
          method: get
          cors:
            origins: ${file(./config/${self:custom.currentStage}.yml):environment.API_ORIGINS}
            allowCredentials: true
  authorizer:
    handler: src/functions/authorizer/authorizer.handler
    role: ${file(./config/${self:custom.currentStage}.yml):provider.execution_role_arn}
  auth:
    handler: src/functions/auth/auth.auth
    role: ${file(./config/${self:custom.currentStage}.yml):provider.execution_role_arn}
    environment: ${self:custom.environmentVariables}
    events:
      - http:
          path: v1/auth
          method: post
          cors:
            origins: ${file(./config/${self:custom.currentStage}.yml):environment.API_ORIGINS}
            allowCredentials: true
      - http:
          path: v1/auth
          method: delete
          authorizer: ${self:custom.authorizer}
          cors:
            origins: ${file(./config/${self:custom.currentStage}.yml):environment.API_ORIGINS}
            allowCredentials: true
            cacheControl: "max-age=0, s-maxage=0, proxy-revalidate"
      - http:
          path: v1/auth
          method: get
          authorizer: ${self:custom.authorizer}
          cors:
            origins: ${file(./config/${self:custom.currentStage}.yml):environment.API_ORIGINS}
            allowCredentials: true
  authCode:
    handler: src/functions/auth/authCode.handler
    role: ${file(./config/${self:custom.currentStage}.yml):provider.execution_role_arn}
    environment: ${self:custom.environmentVariables}
    events:
      - http:
          path: v1/auth/code/{code}
          method: get
          cors:
            origins: ${file(./config/${self:custom.currentStage}.yml):environment.API_ORIGINS}
            allowCredentials: true
  generic:
    handler: src/functions/generic/generic.handler
    role: ${file(./config/${self:custom.currentStage}.yml):provider.execution_role_arn}
    environment: ${self:custom.environmentVariables}
    events:
      - http:
          path: v1/users/{userID}/settings
          method: get
          authorizer: ${self:custom.authorizer}
          cors:
            origins: ${file(./config/${self:custom.currentStage}.yml):environment.API_ORIGINS}
            allowCredentials: true
      - http:
          path: v1/users/{userID}/settings/{settingName}
          method: put
          authorizer: ${self:custom.authorizer}
          cors:
            origins: ${file(./config/${self:custom.currentStage}.yml):environment.API_ORIGINS}
            allowCredentials: true
      - http:
          path: v1/merchants/{userID}/api_credentials
          method: post
          authorizer: ${self:custom.authorizer}
          cors:
            origins: ${file(./config/${self:custom.currentStage}.yml):environment.API_ORIGINS}
            allowCredentials: true
      - http:
          path: v1/merchants/{userID}/api_credentials
          method: get
          authorizer: ${self:custom.authorizer}
          cors:
            origins: ${file(./config/${self:custom.currentStage}.yml):environment.API_ORIGINS}
            allowCredentials: true
      - http:
          path: v1/merchants/{userID}/default_shipping_profile
          method: post
          authorizer: ${self:custom.authorizer}
          cors:
            origins: ${file(./config/${self:custom.currentStage}.yml):environment.API_ORIGINS}
            allowCredentials: true
      - http:
          path: v1/merchants/{userID}/default_shipping_profile
          method: get
          authorizer: ${self:custom.authorizer}
          cors:
            origins: ${file(./config/${self:custom.currentStage}.yml):environment.API_ORIGINS}
            allowCredentials: true
      - http:
          path: v1/merchants/{userID}/price_adjustment
          method: post
          authorizer: ${self:custom.authorizer}
          cors:
            origins: ${file(./config/${self:custom.currentStage}.yml):environment.API_ORIGINS}
            allowCredentials: true
      - http:
          path: v1/merchants/{userID}/price_adjustment
          method: get
          authorizer: ${self:custom.authorizer}
          cors:
            origins: ${file(./config/${self:custom.currentStage}.yml):environment.API_ORIGINS}
            allowCredentials: true
package:
  individually: true
  exclude:
    - node_modules/**
    - config/*.yml
    - README.md
    - package.json
    - yarn.lock
    - src/**/tests/*
    - src/**/*.test.js
    - .*
    - .*/**

stacks-map.js

const EXCLUDE_TRIGGERS = ["Ping", "Auth", "Authorizer", "AuthCode"]

module.exports = (resource, logicalId) => {
  if (EXCLUDE_TRIGGERS.some(trigger => logicalId.startsWith(trigger))) {
    return false
  }

  return null
}