Concerns About Match Rate Drop After Switching from Firebase to MySQL

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Hello,
I recently switched my game app's backend from Firebase to a MySQL-based system due to rising Firebase costs. While there have been no changes to the gameplay itself, only the backend code was altered. Since making the switch, the match rate has dropped from 90% to 68%.

• Will the match rate continue to decline?
• Is this drop a cause for concern?

Despite this drop in match rate, my revenue, requests, and other metrics remain stable, and the app functions smoothly with ads still being served. Additionally, I sent a notification from the Play Console to users of the old APK. Could this be related to the issue?
Any insights or advice would be greatly appreciated. Thank you!