Consecutive hashes create conflicts

[ENikS]

Method hash(...) gets the hash code from the key and applies bitmask to prevent zero hash code. It ORs the actual hashcode with 0b1100_0000_0000_0001

        protected virtual int hash(TKey key)
        {
            Debug.Assert(!(key is null));

            int h = _keyComparer.GetHashCode(key);

            // ensure that hash never matches 0, TOMBPRIMEHASH, ZEROHASH or REGULAR_HASH_BITS
            return h | (SPECIAL_HASH_BITS | 1);
        }

The problem is if two objects have two consecutive hash codes, they will end up with the same hash:

0xXXX0 -> 0xXXX1
0xXXX1 -> 0xXXX1
0xXXX2 -> 0xXXX3
0xXXX3 -> 0xXXX3
0xXXX4 -> 0xXXX5
0xXXX5 -> 0xXXX5
0xXXX6 -> 0xXXX7
0xXXX7 -> 0xXXX7
etc.