Submitted by gpersoon, also found by WatchPug, harleythedog, hubble, xYrYuYx, cmichel, and defsec
The functions \_transferMint() and \_transferBurn() of OverlayToken.sol dont update \_totalSupply.
Whereas the similar functions \_mint() and \_burn() do update \_totalSupply.
This means that \_totalSupply and totalSupply() will not show a realistic view of the total OVL tokens.
For the protocol itself it isnt such a problem because this value isnt used in the protocol (as far as I can see).
But other protocols building on Overlay may use it, as well as user interfaces and analytic platforms.
https://github.com/code-423n4/2021-11-overlay/blob/914bed22f190ebe7088194453bab08c424c3f70c/contracts/ovl/OverlayToken.sol#L349-L364
https://github.com/code-423n4/2021-11-overlay/blob/914bed22f190ebe7088194453bab08c424c3f70c/contracts/ovl/OverlayToken.sol#L376-L395
