tcl expansion doesn't show under some circumstances

[marinier]

Win 10, VSCode, 0.9.12.

1. Have at least 3 tabs open: (1) tcl expansion file, (2) a file that contains code that expands, (3) another file that doesn't have any expansions in it.
2. Click on something in file (2) and confirm that the expansion shows in file (1).
3. Click on the tab for file (3). No need to click anything in the file. Confirm the expansion shown in file (1) is blank.
4. Click on the tab for file (2). The cursor should be back where it was before the switch to (3).

Expected: The expansion for what's under the cursor is shown in file (1).
Actual: File (1) is blank.
Workaround: Move the cursor to a different place in file (2) (keyboard or mouse works). Note that clicking the location the cursor is already at does NOT work.