I’ve seen this happen multiple times. In one example the client was persistent and continuously contacted Google My Business to get it resolved. My client was being ignored for a while and then GMB finally took a look at it and changed it to the correct zip code. A correct and consistent NAP is important for citations.
Previously, there were additional actions in the error reporting form in addition to allowing you to describe the problem in more detail. Now you can only move its location which doesn't help your issue.
In those sort of situations, you would reach out to Google My Business and report errors found on Google Maps (including wrong addresses) for Desktop, Android or iPhone/iPad see the new support article: https://support.google.com/maps/answer/3094088
Here are steps to report address errors to Google.
On your desktop, open Google Maps. Make sure you're signed in.
In the top left, click Menu Send feedback.
In the window that pops up, choose the feedback you would like to give.
Follow the instructions.
Generally speaking, GMb drags their feet in handling issues. Be persistent and keep reporting until they decide to review the issue.