HTML generated mangles field names with underscores

[dkvollmar]

Description

Assuming a field in the schema with underscores
"created_at": {
the field name in the generated JSON is
createdUnderscoreat

openapi-generator version

3.3.2-SNAPSHOT

OpenAPI declaration file content or url

https://gist.github.com/dkvollmar/79b8822ec94073206695366b8674cad2

Command line used for generation

oag generate -i foo.json -g html -o generatedDocs/.

Steps to reproduce

oag generate -i foo.json -g html -o generatedDocs/.

Related issues/PRs

Suggest a fix/enhancement

[farrez]

FYI - I was only able to replicate the issue using the foo.json referenced by using the --skip-validate-spec option. So the command would be something like: 'oag generate -i foo.json -g html -o generatedDocs/. --skip-validate-spec'