IOS15_why the keyboard jerk, when I back

Reproduce Bug:

step 1: Lock screen

Step 2: Touch on screen/ Press [Power] button, to light up the screen

Step 3: Perform swiping to the left of the screen

Step 4: Perform search, will be display searched applications ( condition: keyword have 2 words) Example: Google Maps

Step 5: Tap the one searched application, which will be moved to unlock the screen by faceID or passcode

Step 6: Tap on [Cancel] button, return search screen and keyboard jerking occurs