The result is if one node is removed, it can be updated to a new leaf, however, If more than one nodes were removed, only the last one can be updated to a valid leaf.
Discussed with @cedoor , updating removed node is not an expected behavior.
To Reproduce
Steps to reproduce the behavior:
Go to '...'
Click on '....'
Scroll down to '....'
See error
Expected behavior
check the old leaf with oldLeaf != 0, so that removed node cannot be updated.
Screenshots
If applicable, add screenshots to help explain your problem.
Technologies (please complete the following information):
Solidity version
Additional context
Add any other context about the problem here.
Describe the bug Current _update(..) function does not check if
oldLeaf != 0. https://github.com/privacy-scaling-explorations/zk-kit/blob/9001fdefaf1b9d71250ac1604b8e828c464ffc93/packages/imt.sol/contracts/internal/InternalLeanIMT.sol#L209The result is if one node is removed, it can be updated to a new leaf, however, If more than one nodes were removed, only the last one can be updated to a valid leaf.
Discussed with @cedoor , updating removed node is not an expected behavior.
To Reproduce Steps to reproduce the behavior:
Expected behavior check the old leaf with oldLeaf != 0, so that removed node cannot be updated.
Screenshots If applicable, add screenshots to help explain your problem.
Technologies (please complete the following information):
Additional context Add any other context about the problem here.