fix: isFromTsImporter flag in worker virtual model

[poyoho]

Description

fix: #9882

Additional context

if in worker virtual model will splitFileAndPostfix(importer) first and set options.isFromTsImporter.

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[patak-dev]

@poyoho maybe we should apply this one also to the v3.1 branch too?

[poyoho]

This should only affect the function of the worker. I think is ok 😁