Type1 font missing glyph width from /Widths array

Hi everyone
I am trying to calculate character width in order to show highlighted search results in a PDF document. The problem I have faced is that the /Widths array I am depending on has a portion of its values equal to 0. The values substituted with zeros are the ones that are used in the text. This is probably related to embedded font subsets, but I am not sure at the moment. What are the actions that should be taken in such a situation? See the structure of the mentioned PDF in a screenshot below:
Thank you in advance for your time.

Yes, writing a 0 into the width for a character that has been removed from a subset is a somewhat-common operation.
I am surprised that you are finding glyphs that are actually being used in the content stream with 0 widths.

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