How to correctly compose the KEY argument (bytes32) for positions() method in Sushi V3 Pool?

Question

I'm trying to get pool position parameters, like:

• liquidity
• feeGrowthInside0LastX128
• feeGrowthInside1LastX128
• tokensOwed0
• tokensOwed1

by polling positions() method in pool smart contract (I'm using Sushi V3 Pool). But I always get all zeroes!

Here is response example:

[ positions(bytes32) method Response ]
  liquidity                  uint128 :  0
  feeGrowthInside0LastX128   uint256 :  0
  feeGrowthInside1LastX128   uint256 :  0
  tokensOwed0                uint128 :  0
  tokensOwed1                uint128 :  0

According to interface IUniswapV3PoolState {}, The position's key is a hash of a preimage composed by the owner, tickLower and tickUpper. But how I can make this key?

What I tried:

1. Get address (my wallet address or NFT Position Manager address), convert it to bytes
2. Convert to bytes tick lower and tick upper using BigEndian or LittleEndian
3. Concatenate bytes: 20 bytes of address + 3 bytes of tick lower + 3 bytes of tick upper = 26 bytes total
4. Then I tried to either left pad this key to 32 bytes, or right pad to 32 bytes

In general, I tried all the options, but I always get only zeros!

Here is real live (though out of range) position you can use for investigation. This is DAI/USDT position in Sushi V3 Pool in Scroll network.

• NFT ID: 17959
• Tick Lower: -276333
• Tick Upper: -276317
• Check in pool: https://www.sushi.com/scroll/pool/v3/0x3aF6e93Ab55A78A5Ed01Db6c3bE3Af332b5abd3f/17959
• Interact with Pool smart contract: https://scrollscan.com/address/0x3aF6e93Ab55A78A5Ed01Db6c3bE3Af332b5abd3f#readContract
• Interact with NFT Position Manager contract: https://scrollscan.com/address/0x0389879e0156033202C44BF784ac18fC02edeE4f#readContract

PS. I can more easy get the same position information from NFT Position Manager (it also has positions() method which accepts NFT ID as a parameter), but I really need to interact with positions() method from Pool smart contract.