Thanks for your support of Xiaomi products. The POCO F7 Pro undergoes a strict professional inspection before leaving the factory. The issue you're experiencing with the lock screen effect only plays after a pause after tapping the POCO F7 Pro screen when using a theme is due to a software compatibility issue.
To resolve the issue, please refer to the following information:
1. We recommend updating your phone to the latest OTA version. Software updates include bug fixes and optimizations that can address such display-related issues;
2. Once the update is installed, check if the issue persists. If it does, please consider resetting the lock screen wallpaper or try using a different theme. Thank you for your feedback. Your feedback is the driving force for us to continuously improve the product experience.