"how is TAStudio open with no game loaded? please report this including as much detail as possible"

Summary

System.InvalidOperationException: how is TAStudio open with no game loaded? please report this including as much detail as possible

Reporting as it asked me to (and the error gave me a chuckle), will probably work around it with Bizhawk 2.4 and copying inputs.

Repro

1. Open BizHawk 2.11
2. Load Sonic The Hedgehog 2 (EB) (V1.0) [!].sms (doesn't seem to matter if SMSHawk or GPGX).
3. Open TAStudio
4. Open Challenger's bk2 UserFile from Bizhawk 2.4: https://tasvideos.org/UserFiles/Info/638693521322570251
5. Accept the Conversion to tasproj dialog

7. Click ok. ROM and TAStudio will close.
8. Error; See Output

Output

System.InvalidOperationException: how is TAStudio open with no game loaded? please report this including as much detail as possible
   at BizHawk.Client.EmuHawk.TAStudio.StartNewTasMovie() in /src/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.cs:line 586
   at BizHawk.Client.EmuHawk.TAStudio.LoadFileWithFallback(String path) in /src/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.cs:line 685
   at BizHawk.Client.EmuHawk.TAStudio.LoadMovieFile(String filename, Boolean askToSave) in /src/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.MenuItems.cs:line 98
   at BizHawk.Client.EmuHawk.TAStudio.OpenTasMenuItem_Click(Object sender, EventArgs e) in /src/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.MenuItems.cs:line 84
   at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e)
   at System.Windows.Forms.ToolStripMenuItem.OnClick(EventArgs e)
   at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)
   at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
   at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)
   at System.Windows.Forms.ToolStripDropDown.OnMouseUp(MouseEventArgs mea)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ToolStrip.WndProc(Message& m)
   at System.Windows.Forms.ToolStripDropDown.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Host env.

• BizHawk 2.11; Win11

Start in BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.cs at StartNewTasMovie and LoadFileWithFallback, then review TAStudio.MenuItems.cs around LoadMovieFile and OpenTasMenuItem_Click. Reproduce with BizHawk 2.11, the Sonic The Hedgehog 2 ROM, and UserFile 638693521322570251. Done means the converted movie opens without closing the ROM or TAStudio and without throwing this exception.