Empty modeller screen if JS aggregation is enabled

Issue information

From user: drubb

Adding a new model isn't possible if JS aggregation is enabled for the site. There's only an empty screen with a Save button, symbols and sidebar are missing. The console throws a syntax error.

Disabling JS aggregation completely solves this issue.

Adding {preprocess: false} for the bpmn js libraries doesn't.

Edited Dec 17, 2025 by drupalbot

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