This edge count is used for weighing, and it is somewhat trivial to review and verify that the current implementation was ignoring `votes16` field of the struct. As reminder, the struct is like this:
```rust
struct Compact {
votes1: ... ,
votes2: ...,
...,
votes16: ...,
}
```
I already will fix this in https://github.com/paritytech/substrate/pull/7007, but since it might take a while, this one can go in asap and make it to the very next runtime.