Thank you for posting in this community.
I used your "NY 542 Residency check" example and tested it in my environment.
In my test environment, however, it returns the results correctly whether I enter "NY", "542", or part of "NY 542 Residency check" as a keyword.
Although I was not able to reproduce your question, we can work together to narrow down and resolve the situation. So, please kindly provide more information below to let us work further.
1.Since I'm not quite sure if there are any other customizations you've made to your web parts. Please try deleting and re-adding the web parts, just setting the available data source to SharePoint Search and displaying the search results in the PnP Search Results web part. Test to see if there is still an issue with the search results.
2.If the results show up fine in the first step, then try adding your customized settings step by step and test the search results after each step. This way we can locate if any of the settings are causing the problem. You can share the custom settings that are causing the problem with me, which makes it easier for me to test. Please take care to code your private information.
3.If the result in the first step shows an exception. Then I suggest you redeploy PnP Modern Search Web Parts v4.
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4.Check if the same issue occurs with other users. View through another computer or account.
5.Check if the same issue occurs with other SharePoint site collections.
6.Try to use a different browser or your browser's InPrivate mode to see if the same error occurs.
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