Environment

Windows build number: 18363.476
Windows Terminal version (if applicable): 0.7.3291.0

Steps to reproduce

1. create lots of split panes and resize some panes.
2. run exit on some of panes to close some panes.
3. sometimes other panes won't take up the spaces of closed panes.

Expected behavior

Other panes should take up the blank space of the window after I close some panes.

Actual behavior

The blank spaces still leave blank.

However, if you resize the window, the panes will return to normal.