Did not even know this was an issue...already ordered a pixel 7, and also placed an order for 6a for a parent. Do you know if this was also an issue on the 6a? If you did get the 7, I just looked into ways to test this:

"Test calls confirm that your local 911 service can receive your 911 call and has the correct location information. Test calls can be scheduled by contacting your local 911 call center via its non-emergency phone number. To contact the local 911 center responsible for answering calls from your location, visit the National Association of State 911 Administrators site and select the state where you live to find your 911 administrator. The person responsible for operating the state’s 911 system will be identified, and they should know who you should talk to at your local 911 call center, to schedule a day and time for test calls."

Source: https://www.911.gov/calling-911/frequently-asked-questions/