fix: DXOC-200 lateinit var isBuilt not initialized

[bohan-amplitude]

Summary

change isBuilt to val from lateinit var

Checklist

• [x] Does your PR title have the correct title format?
• Does your PR have a breaking change?: no

[github-actions[bot]]

:tada: This PR is included in version 1.4.3 :tada:

The release is available on:

• GitHub release
• v1.4.3

Your semantic-release bot :package::rocket: