Incorrect geocoding when suite number included in address

Thanks for reporting this @wrd-oaitsd...
could you be more specific (?) when you state:

I noticed a similar problem reported several years ago for a 7.x release.

pointing to/linking to the specific issue you are referring to, to give us more context.

How can we / can we assume that this is actually a bug of the Drupal Geocoder module?
From what you describe it seems rather a problem (or a specific result) of the GoogleMapsBusiness geocoder service (@see https://github.com/geocoder-php/Geocoder#world),
and not something to input to the specific Drupal Geocoder module provider (which is just a wrapper/host of the former, via https://github.com/geocoder-php/google-maps-provider) .

Or do you have the clear idea that all this depends on the Drupal Geocoder provider GoogleMapsBusiness? How can you prove it?

Have you also checked other geocoding providers as a useful comparison?

I included the link to the other issue in the "Related issues", but to include it here as well, it can be found at: https://www.drupal.org/project/geocoder/issues/3059514 →

Testing out Google's geocoding example code on jsfiddle:
https://jsfiddle.net/gh/get/library/pure/googlemaps/js-samples/tree/mast...

...produces the same result if I input the address like so:

Input: 408 Washington Avenue Suite 100 West Plains, MO 65775 United States

{
  "results": [
    {
      "address_components": [
        {
          "long_name": "100",
          "short_name": "100",
          "types": [
            "subpremise"
          ]
        },
        {
          "long_name": "408",
          "short_name": "408",
          "types": [
            "street_number"
          ]
        },
        {
          "long_name": "Washington Avenue",
          "short_name": "Washington Ave",
          "types": [
            "route"
          ]
        },
        {
          "long_name": "Downtown Houston",
          "short_name": "Downtown Houston",
          "types": [
            "neighborhood",
            "political"
          ]
        },
        {
          "long_name": "Houston",
          "short_name": "Houston",
          "types": [
            "locality",
            "political"
          ]
        },
        {
          "long_name": "Harris County",
          "short_name": "Harris County",
          "types": [
            "administrative_area_level_2",
            "political"
          ]
        },
        {
          "long_name": "Texas",
          "short_name": "TX",
          "types": [
            "administrative_area_level_1",
            "political"
          ]
        },
        {
          "long_name": "United States",
          "short_name": "US",
          "types": [
            "country",
            "political"
          ]
        },
        {
          "long_name": "77002",
          "short_name": "77002",
          "types": [
            "postal_code"
          ]
        }
      ],
      "formatted_address": "408 Washington Ave #100, Houston, TX 77002, USA",
      "geometry": {
        "location": {
          "lat": 29.7654582,
          "lng": -95.3614463
        },
        "location_type": "RANGE_INTERPOLATED",
        "viewport": {
          "south": 29.7640738197085,
          "west": -95.3627994802915,
          "north": 29.7667717802915,
          "east": -95.3601015197085
        }
      },
      "place_id": "Ei80MDggV2FzaGluZ3RvbiBBdmUgIzEwMCwgSG91c3RvbiwgVFggNzcwMDIsIFVTQSI6GjgKMRIvChQKEgnJRi06Lr9AhhGV09IgdaweuhCYAyoUChIJM09JeVPHQIYRFNRygKFHGo0SAzEwMA",
      "types": [
        "subpremise"
      ]
    }
  ]
}

If I add a comma after the address and before the city name, the result is correct:

Input: 408 Washington Avenue Suite 100, West Plains, MO 65775 United States

{
  "results": [
    {
      "address_components": [
        {
          "long_name": "100",
          "short_name": "100",
          "types": [
            "subpremise"
          ]
        },
        {
          "long_name": "408",
          "short_name": "408",
          "types": [
            "street_number"
          ]
        },
        {
          "long_name": "Washington Avenue",
          "short_name": "Washington Ave",
          "types": [
            "route"
          ]
        },
        {
          "long_name": "Downtown Houston",
          "short_name": "Downtown Houston",
          "types": [
            "neighborhood",
            "political"
          ]
        },
        {
          "long_name": "Houston",
          "short_name": "Houston",
          "types": [
            "locality",
            "political"
          ]
        },
        {
          "long_name": "Harris County",
          "short_name": "Harris County",
          "types": [
            "administrative_area_level_2",
            "political"
          ]
        },
        {
          "long_name": "Texas",
          "short_name": "TX",
          "types": [
            "administrative_area_level_1",
            "political"
          ]
        },
        {
          "long_name": "United States",
          "short_name": "US",
          "types": [
            "country",
            "political"
          ]
        },
        {
          "long_name": "77002",
          "short_name": "77002",
          "types": [
            "postal_code"
          ]
        }
      ],
      "formatted_address": "408 Washington Ave #100, Houston, TX 77002, USA",
      "geometry": {
        "location": {
          "lat": 29.7654582,
          "lng": -95.3614463
        },
        "location_type": "RANGE_INTERPOLATED",
        "viewport": {
          "south": 29.7640738197085,
          "west": -95.3627994802915,
          "north": 29.7667717802915,
          "east": -95.3601015197085
        }
      },
      "place_id": "Ei80MDggV2FzaGluZ3RvbiBBdmUgIzEwMCwgSG91c3RvbiwgVFggNzcwMDIsIFVTQSI6GjgKMRIvChQKEgnJRi06Lr9AhhGV09IgdaweuhCYAyoUChIJM09JeVPHQIYRFNRygKFHGo0SAzEwMA",
      "types": [
        "subpremise"
      ]
    }
  ]
}

I'll see if I can test with a different geocoder and see if the result is different.

I'm getting the same result when using the Nominatim service.