SSIS Conditional split triggering wrong script component PostExecute method

You can build out a simple reproduction that does shows the conditional split is probably doing what it should be doing

Here I generate 2 rows, with the bit set to true and false and see the correct path lighting up. And then I make both False and zero rows route to the Row Count component and it gets the green check as does the Script component

If you look down to the Output, you'll see a line that says

Information: 0x0 at DFT Demo, PostExecute of Expired path: RowsReceived = False

While you don't show the code for your PostExecute, I'm willing to post an answer with an edumacated guess. The PostExecute event is going to fire every time, whether there was any data to light up the component or not. This is very common in SSIS stuff as it needs to do cleanup after itself so logic you have in your Script Component is going to fire every time, unless you tell it not to.

In the following script task I declare a member variable called rowsReceived and initialize it to False.

In my PostExecute method, I write to the output log twice. The first is the message you see in my screenshot. The second, inside the If block will only fire in the event that row actually landed in the component.

The final and most trivial piece is the ProcessInputRows method. Whether 1 row or a billion, they'll all evaluate the same in that they flip our rowsReceived from False to True.

using System;
using System.Data;
using Microsoft.SqlServer.Dts.Pipeline.Wrapper;
using Microsoft.SqlServer.Dts.Runtime.Wrapper;

[Microsoft.SqlServer.Dts.Pipeline.SSISScriptComponentEntryPointAttribute]
public class ScriptMain : UserComponent
{
    bool rowsReceived;

    public override void PreExecute()
    {
        base.PreExecute();
        rowsReceived = false;
    }

    public override void PostExecute()
    {
        base.PostExecute();
        bool fireAgain = false;
        ComponentMetaData.FireInformation(0, "PostExecute of Expired path", string.Format("RowsReceived = {0}", rowsReceived), "", 0, ref fireAgain);
        if (rowsReceived)
        {
            ComponentMetaData.FireInformation(0, "PostExecute of Expired path", "DO TASK HERE TO REFRESH TOKENS", "", 0, ref fireAgain);
        }
    }

    public override void Input0_ProcessInputRow(Input0Buffer Row)
    {
        rowsReceived = true;
    }

}

Switching my source query back to 1 false, 1 true, you can see a new message showing up in the Output log that corresponds to placeholder where you would perform token refresh activities.

Make sense?