Cannot resolve variable Deprecation warnings with serverless 2.25.1

[mobsense]

I'm seeing lots of deprecation warnings like below with serverless 2.25.1.

The stack actually works and did not warn with earlier versions

The variables that are warning, are actually defined AFTER the plugin is processed. It seems that the new serverless version is
emitting the warnings before running the import-config plugin.

How can I suppress the warnings?

Serverless: Deprecation warning: Variables resolver reports following resolution errors:
              - Cannot resolve variable at "provider.environment.DB_TABLE": Value not found at "self" source,

My serverless.yml looks like this:

plugins:
- serverless-import-config-plugin

custom:
  import:
    - '../include/base.yml'

provider:
  name: aws

  environment:
    DB_TABLE: ${self:custom.tableName}

Here are my deps:

├── @babel/cli@7.12.10
├── @babel/core@7.12.10
├── @babel/plugin-proposal-class-properties@7.12.1
├── @babel/plugin-proposal-object-rest-spread@7.12.1
├── @babel/preset-env@7.12.11
├── amazon-cognito-auth-js-promises@1.1.5
├── amazon-cognito-auth-js@1.3.3
├── amazon-cognito-identity-js@4.5.8
├── aws-sdk@2.845.0
├── babel-loader@8.2.2
├── babel-plugin-source-map-support@2.1.3
├── dynamodb-onetable@1.4.2
├── express@4.17.1
├── gulp-exec@5.0.0
├── gulp@4.0.2
├── install@0.13.0
├── npm@6.14.11
├── raw-loader@4.0.2
├── require-dir@1.2.0
├── serverless-domain-manager@5.1.0
├── serverless-dynamodb-client@0.0.2
├── serverless-dynamodb-local@0.2.39
├── serverless-http@2.6.1
├── serverless-import-config-plugin@0.1.3
├── serverless-offline-scheduler@0.4.2
├── serverless-offline@6.9.0
├── serverless-s3-deploy@0.9.0
├── serverless-webpack@5.3.5
├── serverless@2.25.1
├── source-map-support@0.5.19
├── webpack-node-externals@2.5.2
└── webpack@5.15.0