Model type "buffer" is not working

Describe the bug

Getting below error after creating model with buffer type property.

Request POST /tests failed with status code 500. Error: type must be JSONType or JSONType[]: buffer

Model Property (Entity):
@property({ type: 'buffer', }) image?: Buffer;
Steps to reproduce:

1. Create new app: lb4 app
2. Add new model with buffer type property (not required field): lb4 model
3. Add any type of db: lb4 datasource
4. Create repository: lb4 repository
5. Create controller with all CRUD operations: lb4 controller
6. Test POST request on explorer

Logs

Request POST /tests failed with status code 500. Error: type must be JSONType or JSONType[]: buffer
    at getJSONTypes (/Users/shailendrasingh/Documents/workspace/testapp/node_modules/ajv/lib/compile/validate/dataType.ts:36:9)
    at getSchemaTypes (/Users/shailendrasingh/Documents/workspace/testapp/node_modules/ajv/lib/compile/validate/dataType.ts:20:17)
    at typeAndKeywords (/Users/shailendrasingh/Documents/workspace/testapp/node_modules/ajv/lib/compile/validate/index.ts:159:31)
    at subSchemaObjCode (/Users/shailendrasingh/Documents/workspace/testapp/node_modules/ajv/lib/compile/validate/index.ts:147:3)
    at subschemaCode (/Users/shailendrasingh/Documents/workspace/testapp/node_modules/ajv/lib/compile/validate/index.ts:124:7)
    at KeywordCxt.subschema (/Users/shailendrasingh/Documents/workspace/testapp/node_modules/ajv/lib/compile/validate/index.ts:491:5)
    at applyPropertySchema (/Users/shailendrasingh/Documents/workspace/testapp/node_modules/ajv/lib/vocabularies/applicator/properties.ts:45:11)
    at Object.code (/Users/shailendrasingh/Documents/workspace/testapp/node_modules/ajv/lib/vocabularies/applicator/properties.ts:32:9)
    at keywordCode (/Users/shailendrasingh/Documents/workspace/testapp/node_modules/ajv/lib/compile/validate/index.ts:523:9)
    at /Users/shailendrasingh/Documents/workspace/testapp/node_modules/ajv/lib/compile/validate/index.ts:265:9
    at CodeGen.code (/Users/shailendrasingh/Documents/workspace/testapp/node_modules/ajv/lib/compile/codegen/index.ts:525:33)
    at CodeGen.block (/Users/shailendrasingh/Documents/workspace/testapp/node_modules/ajv/lib/compile/codegen/index.ts:680:20)
    at iterateKeywords (/Users/shailendrasingh/Documents/workspace/testapp/node_modules/ajv/lib/compile/validate/index.ts:262:7)
    at groupKeywords (/Users/shailendrasingh/Documents/workspace/testapp/node_modules/ajv/lib/compile/validate/index.ts:241:7)
    at /Users/shailendrasingh/Documents/workspace/testapp/node_modules/ajv/lib/compile/validate/index.ts:233:38
    at CodeGen.code (/Users/shailendrasingh/Documents/workspace/testapp/node_modules/ajv/lib/compile/codegen/index.ts:525:33)

Additional information

No response

Reproduction

https://github.com/shailendramonu/testlb4app

Open the linked reproduction and recreate the generated model, datasource, repository, controller, and POST request described in the issue. Trace the validation path that rejects the model's optional Buffer property, then add coverage showing that the POST request no longer fails with the AJV JSONType error.