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fix(router): mid-stream fallback 400s on models without assistant prefill (Claude Sonnet 4.6+) - #30743

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mateo-berri wants to merge 13 commits into
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litellm_midstream_fallback_prefill_claude46
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mateo-berri wants to merge 13 commits into
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litellm_midstream_fallback_prefill_claude46

fix(router): mirror last-wins for stripped/wildcard dict fallback res…

2068377
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Cursor / Cursor Bugbot succeeded Jun 18, 2026 in 32s

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✅ Gathered PR context (16s)
✅ Completed bug detection (35s)
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Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_5e6569b2-bfe2-453d-ae04-133746f51ae8

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