DFDL intellisense not working correctly when starting a debug session from scratch

[rt320]

DFDL Intellisense doesn't work when starting a debug session from scratch. This behavior happens in Windows 10 environments.
Steps to reproduce:
Using the ctc repo main branch source code loaded (commit 4401cc8),
Run the the extension in debug mode, which opens a new VS Code window running the extension.
The new VS Code window opens to the "getting started" tab only.
Open the debug panel and run "ask for file name", supply the schema file and data file.
On a new line in the schema type the first few letters of a dfdl element.
The language mode is set to xml
Instead of showing the dfdl specific auto completion, a generic auto completion of alphabetic, xml, and dfdl snippets are returned.
Change the language mode to dfdl and re-type the first few letters of a dfdl element.
A set of alphabetic only autocompletions will result.
Stop debugging the extension, leave the schema file open.
Stop the debugger in the source code VS Code window.
Restart the extension in debug mode.
The extension will open in a new VS Code window. The schema from the previous run will still be open.
Open the debug panel and run "ask for file name", supply the same file names as the previous run.
Type the first few letters of a dfdl element, the dfdl intellisense autocomplete will return only items relevant to dfdl schemas.

[rt320]

Closed wrong issue.