Gpt-4o-mini-tts-2025-12-15 still truncates final sentences; 2025-03-20 is being deprecated

We’re hitting this too. Tested 16 multi-sentence inputs (~80–180 chars, en/es/fr/de) through gpt-4o-mini-tts (default snapshot, voice=alloy, response_format=pcm) — 3 of 16 came back with the final sentence missing. ~19% on this input shape.

This is a real production blocker: a ~20% silent failure where the request returns 200 with truncated audio (no error, no retry signal) is very hard to ship around without building duration-vs-text sanity checks on every call. Any ETA on a fix in the current snapshot?