A bag does not restore a failed seam or make loose filling safe to process. The pillow needs to be intact and suitable for the selected drying method.
Understanding this situation
Escaping material can spread beyond the item and create a different issue from ordinary lint. A bag itself can also fail or restrict movement if overfilled.
A useful next step
Repair or replace the textile appropriately before permitted drying. If filling has already escaped, follow safe model-specific cleaning guidance and report any unusual sound or smell. Do not run further loads through substantial debris to clear it away.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.