Environment

Windows build number:  10.0.18363.0
Windows Terminal version (if applicable): 1.1.1671.0

Any other software? No

Steps to reproduce

Run a command line which opens multiple tabs, and some split panes. Supply a name for each tab using --title.

Example command line:

wt.exe -p "Command Prompt" -d . --title Cmd1 ; split-pane -H -p Cmd -d . ; new-tab -p "Windows PowerShell" -d . --title Posh1 ; new-tab -p "Windows PowerShell" -d . --title Posh2 ; split-pane -H -p "Windows PowerShell" -d . ; split-pane -H -p "Windows PowerShell" -d . ; new-tab -p "Windows PowerShell" -d . --title Posh3 ; split-pane -V -p "Windows PowerShell" -d .

Expected behavior

Each tab gets the name you assigned it.

Actual behavior

Tabs sometimes get the names you supplied, and sometimes not. Since this problem is intermittent, I suspect it's a threading bug. I would guess you are using the same string variable to parse parts of the command line successively and passing each to a thread. The variable is getting clobbered.

Also of note, this is likely the same problem that is causing #6340, because they also describe it happening intermittently.

Thanks.