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Issue in high band during concealment for stereo 48 kbps

When decoding this bistream with 518d9f24 :

bit.bfi

image

The attached bitstream is a truncated and amplified variant from the ltv available. The same problem can be seen twice on this short vector multiple times on the ltv (the figure shown the issue at ~16 sec for the right channel). it happens during the concealment part. So far, it seems to happen mainly at 48 kbps, I have seen it only once at 64 kbps, but to a less problematic level.