Can a better prompt fix Arabic and Hindi text? Three tricks, three models, 12 GB card

Earlier today Arabic text failed on all three models and Hindi failed on two. The obvious follow-up: does the way the prompt is written change that?
The test
We re-ran the failing strings with three changes, two seeds each, same settings as before, one rented RTX 5070 12GB per model (24 pictures per model): 1. Script hint: add "written in Arabic script" / "written in Devanagari script, spelled exactly as given". 2. One word only: ask for a single large word ("مهرجان", "विशेष"…) instead of two lines. 3. Plain card: one line of large bold black text on a white card, nothing else.
What we saw (judged by eye from the pictures, not counted)
- None of the three tricks fixed Arabic. Even on a plain white card, every model still changed letters in the first word of «طبق اليوم»: «طيق» (Qwen, FLUX), «طتى» (MOSS), and one-word menus came out as «طرق» or «نطيق». Titles on the card came out as «مجاجان», «مبهجان», «ميرحان» or «مرجل» instead of «مهرجان».
- Hindi stayed model-dependent. FLUX.3 klein again wrote «उत्सव» and «आज का विशेष» cleanly in most pictures; its «ग्रीष्म» conjunct still looks slightly off on some. Qwen kept writing «विशेथ» and MOSS «विशेए» even on the plain card.
- The only visible gain: Qwen wrote the menu line «हरी चाय» correctly in both seeds once we added the script hint (it had written «हरी याय» before).
- Plain cards did make the text easy to read, which makes the errors easy to see; they did not make the spelling correct.
How much to trust this
- We do not read Arabic or Hindi natively and compared letters with the prompt; no numeric score this time because several pictures were borderline. Corrections are welcome via the report page.
- Two seeds per prompt, one machine per model.
- It suggests these models need more than prompt wording for Arabic and some Hindi conjuncts; we have not tested fine-tuning or other tricks.
