Quick answer: Construct 3 effect stack rendering in different order after an editor version bump? Stack order is preserved but render passes can change priority - audit stack order in the project.
Bloom + chromatic + scanlines. Pre-update: bloom-then-scanlines. Post-update: scanlines-then-bloom.
Audit stack order in inspector
Object's effect tab. Verify order matches your intent; reorder if needed.
Lock effects with custom names
Custom names in code reference. If order is critical, drive via expressions, not implicit stack order.
Document the order
Comments next to each effect in project explaining why this order. Future-you will thank present-you.
“Effect order is a render decision. Render decisions change between engine versions.”
After every Construct 3 update, screenshot the effect stacks. Visual diff catches drift; the test is cheap.