The amino encoding of the types.Header doesn't match the proto3 encoding of the abci.Header. See the failing test in #2681.

Even when we use amino v0.13, it still doesn't match. For the empty time, we get:

expected: []byte{0x22, 0xb, 0x8, 0x80, 0x92, 0xb8, 0xc3, 0x98, 0xfe, 0xff, 0xff, 0xff, 0x1}
actual  : []byte{0xa, 0x0, 0x22, 0xb, 0x8, 0x80, 0x92, 0xb8, 0xc3, 0x98, 0xfe, 0xff, 0xff, 0xff, 0x1, 0x3a, 0x2, 0x12, 0x0}

where the former is Amino encoding, the later is proto3 encoding. Note the proto3 encoding prepends and appends some bytes to the Amino encoding.

This should probably block v0.26