The issue was caused by mesh needed for dynamic paint brush being stored in the modifier. That make it to be freed and set to NULL when running copy-on-write. Solved by moving the mesh to be stored in modifier's runtime data.
The issue was caused by mesh needed for dynamic paint brush being stored in the modifier. That make it to be freed and set to NULL when running copy-on-write. Solved by moving the mesh to be stored in modifier's runtime data.