How determine which fonts are used in substitutions

In a spreadsheet using version 7.4.7.2 I had arial 10 font and a seven digit number like 1234567 fit into a column width of 0.57" after upgrading to version 25.2.3.2 the same numbers no longer fit in the columns.
arial wasn’t installed in 7.4.7.2 and localc used another font to substitute.
Nor is it installed in 25.2.3.2 so again localc is substituring but not with the same font.
How do I determine which font is being used for the substitution?

Thanks,
Mike

For Arial, the substitution is hardcoded: it’s Liberation Sans.

Otherwise, there is a programmatic way.

This is likely a bug.

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Please upload a fragment of this file that demonstrates the problem.

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