Our local test servers default to $nbsp; for zc158 and zc158a or display nothing with zc200.
Production servers running on virtual hosts default to $nbsp; for zc158 and zc158a
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If no number is shown, it's because it is 0 which is no limit (https://github.com/zencart/zencart/issues/6228).
I'll note that my hosting company has their shared server option limited to 25.
I was getting errors from this so moved to their VPS option with no limit/my limit. No errors since.
For interest I reduced this to 25 recently. No errors since, so I'm assuming it was some external factors triggering those errors on the shared server.