We ran 120 AI generations across the hardest real-world edge cases, found every failure mode, and fixed what we could. Here's exactly what works, what doesn't, and why.
These failures are fundamental to how Flux Kontext Pro works. No amount of prompt engineering fixes them — they require architectural changes to the pipeline.
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Restyle on strongly-styled furnished rooms
When the input has saturated, well-composed furniture (dark velvet sofa, matched color scheme), the model keeps it. Text instructions cannot override dominant visual conditioning.
When the room has exposed brick, track lights, and industrial aesthetic, the model refuses to place velvet or birch furniture. Only a rug is placed. Modern + neutral_sale work fine in the same room.
"MANDATORY PLACEMENT regardless of room style" instruction added in v4 — zero effect. Recommend modern or neutral_sale for industrial rooms.
UI warning planned
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Declutter on completely windowless dark rooms
When a room has zero architectural anchors visible (all walls hidden by shelving, no windows, no light source), the model cannot remove clutter without reference points — it reimagines the entire room.
"CRITICAL: do not reimagine" instruction in v4 — zero effect. Needs upload-time darkness detection to warn users before generation.
Roadmap: darkness detection
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Premium mode seed variance on very dark rooms
On deeply underexposed rooms, some seeds latch onto the dark input and don't diverge — the output stays dark. Other seeds brighten correctly.
Workaround: always generate 3 variants. 2/3 work correctly. The 1/3 failure rate is acceptable for practical use.
Workaround: 3 variants
Conclusions
✅Pipeline is rock solid — 120 generations, 0 API failures, 0 data loss bugs.
✅Architecture preservation is excellent — windows, arches, brick, sloped ceilings, mirrors all survive.
✅empty_staging works for all room types with modern/minimalist/cozy_family/neutral_sale styles.
✅Prompt engineering moved the quality score from 6.0 → 7.4 in one session.
⚠️Restyle on strongly-styled rooms (dark velvet, heavily saturated) needs a 2-stage pipeline — pure prompt work hit the ceiling.
⚠️Luxury + Scandinavian in industrial rooms: only a rug. Model ceiling confirmed. Recommend modern/neutral_sale for these rooms.
⚠️Declutter on completely dark/windowless rooms reimagines the room entirely. Upload-time brightness detection needed.