Note: At the judges request here, this downgraded issue from the same warden has been included in this report for completeness.
ERC1155Minimal and SemiFungiblePositionManager contracts do not comply with ERC1155 token standard.
SemiFungiblePositionManager is the ERC1155 version of Uniswaps NonFungiblePositionManager contract and it is stated that SemiFungiblePositionManager should comply with the ERC1155.
EIP-1155 and all the rules for this token standard can be found here:
https://eips.ethereum.org/EIPS/eip-1155
Lets check the safeBatchTransferFrom rules:
However, ERC1155Minimal contract does not check these array lengths and does not revert when there is a mismatch.
This contract is modified from the Solmate to be more gas efficient, but the input length mismatch check is missed while modifying.
Here is the ERC1155Minimal contract safeBatchTransferFrom function:  
As we can see above, there is no check in terms of ids length and the amounts length.
EIP-1155 compliant version of this implementation on Solmate can be found here:  
EIP-1155 compliant version of this implementation on OpenZeppelin can be found here (_safeBatchTransferFrom will call _update function and the check is in this _update function):  
NOTE: I also submitted another EIP compliance issue which is related to to address being zero. This issue is a separate breach of the rules and a different root cause. Therefore, I submitted this one as a separate issue since fixing only one of them will not make the contract EIP compliant.
The code snippet below shows successful transfer action with mismatching array length. You can use protocols test suite to run it.
Results after running the test:
I would recommend checking input array lengths and reverting if there is a mismatch.
