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- YouTube increasingly serves SABR/modified DASH. When the primary player response lacks usable stream URLs, Invidious falls back to alternate clients. Historically only adaptiveFormats were patched in fallback. This change patches whichever sections are actually missing (adaptiveFormats and/or formats), but only when the fallback contains usable entries (url or signatureCipher/cipher), avoiding overwriting valid primary data. - Adds a debug log (fallback_patched) to indicate which client patched which sections and a playback_404 triage log with stream counts to ease diagnosis. - Fixes #5420