You probably don’t need to get a new plate or sticker. Bambu recommends some steps to fix this issue.
- Place the Cool Plate face down on the heated bed, with the Engineering side on top.
- Set the bed temperature to 100C and wait for 5-10 minutes
- Set the temperature to 30C and wait until the bed cools down to that temperature
- Remove the plate and inspect it, to see if the bubbles are removed.