I wasn't able to reproduce the problem. Also, the script needed some changes to run under strict
The word "tag" has a special meaning in the Tk domain. You aren't storing any tags in the @TAGS array, you're storing ids of the rectangles.
What about using a single tag for the background?
$i * $ps, $j * $ps,
$i * $ps + $ps, $j * $ps + $ps,
-fill => $c,
-outline => $c,
-tags => ['bg']);
The erase routine can be now simplified to
No need to store any tags/ids anywhere. That's usually the reason why to use the Canvas.
Update: I would also use tags for the lines, so you can easily raise them above the new background.
$canvas->createLine($start_x, $start_y, $x1, $y1,
-width => 2,
-fill => 'white',
-tags => ['fg']);
# and after drawing the new background:
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