[Bug]: Ballerina imported types from the submodules throws diagnostics issues

[samithkavishke]

Description

The current language-server throws diagnostics issue for the types which have been imported from the sub modules of the library. This issue has thrown from the wso2 integrator,
wso2/product-integrator#388

Steps to Reproduce

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Affected Version(s)

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OS, DB, other environment details and versions

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Related area

-> Compilation

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