v0.7.20 Kusama CC3 node sync stuck

[zxyge]

Ubuntu Ubuntu 18.04.3 LTS, kernel: Linux version 4.15.0-74-generic

issues # 859 is closed, but I have this problem after running kusama

Kusama CC3 version：v0.7.21 & v0.7.20

log：
2020-02-28 06:40:16 Verification failed from peer: UnknownBlock: State already discarded for BlockId::Hash(0xc6051b824a0ae1370dfe4198085c04babbc36d9c8bfcb57a9e3e96a3681bcc10) 2020-02-28 06:40:17 Verification failed from peer: UnknownBlock: State already discarded for BlockId::Hash(0xc6051b824a0ae1370dfe4198085c04babbc36d9c8bfcb57a9e3e96a3681bcc10) 2020-02-28 06:40:17 Verification failed from peer: UnknownBlock: State already discarded for BlockId::Hash(0xc6051b824a0ae1370dfe4198085c04babbc36d9c8bfcb57a9e3e96a3681bcc10) 2020-02-28 06:40:17 Verification failed from peer: UnknownBlock: State already discarded for BlockId::Hash(0xc6051b824a0ae1370dfe4198085c04babbc36d9c8bfcb57a9e3e96a3681bcc10) 2020-02-28 06:40:18 Verification failed from peer: UnknownBlock: State already discarded for BlockId::Hash(0xc6051b824a0ae1370dfe4198085c04babbc36d9c8bfcb57a9e3e96a3681bcc10)

[bkchr]

Hey, this is a duplicate of #861

It is already fixed, but we need to release a new version.