I am having trouble with my colorscheme in
[filling in for the OP, see the comment]
The OP found the issue:
I needed to have this set:
This forces background colours to refresh.
"Change background-color-erase setting. If
bceis set to “on”, all characters cleared by an erase/insert/scroll/clear operation will be displayed in the current background color. Otherwise the default background color is used."
– Ravi 19 hours ago