Incorrect path encoding order in `exactOutputSingle`

[zakrad]

I was testing exactOutputSingle on Router and ran into an issue where the swap fails, but the same swap worked fine using exactOutput with a manually encoded path.
this implementation for exactOutputSingle

SwapCallbackData({ 
    path: abi.encodePacked(params.tokenOut, params.tokenIn, params.tickSpacing), 
    payer: msg.sender 
});

It seems like the path is being encoded as tokenOut + tokenIn + tickSpacing in exactOutputSingle while I am able to use exactOutput with tokenOut + tickSpacing + tokenIn
could this be causing the exactOutputSingle swap to fail due to the incorrect path format in the callback?