Grails 3.X: GSP: multiple false 'Cannot resolve symbol ..' inspections in view files

_⚠️ attachment `grails.jpg` was not included in the export_

Test project attched (controller and views are generated using stating scaffolding).
Despite inspections application runs correctly

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*1 attachment(s) referenced here (`grails.jpg`) are not part of the CSV export.*
*Imported from [IDEA-175316](https://youtrack.jetbrains.com/issue/IDEA-175316) · Type: Bug · Votes: 2*
*Comments, attachments, dates and reporter are not part of the export — follow the link above for the full history.*

Start with the linked IDEA-175316 report and the attached scaffolding test project, noting that the project image is unavailable in this export. Reproduce the false “Cannot resolve symbol” inspections in the generated GSP views and confirm the inspections disappear while the application still runs correctly.

Written by the indexing model from the issue text.