https://wccftech.com/ipad-pros-liquid-retina-xdr-display-minimizes-blooming-but-still-appears-for-some-users/

While Apple claims that the blooming effect on the 12.9-inch iPad Pro's Liquid Retina XDR display is minimized, some users are still experiencing it. Apple launched the new iPad Pro models last month and the biggest, most noticeable addition to the 12.9-inch iPad Pro model is the use of Liquid Retina XDR display. It is a mini-LED display that is also expected to arrive on MacBook models in the coming months.

Apple's recently published support document suggests that the Liquid Retina XDR display is designed to minimize "the trade-offs of typical local dimming systems, where the extreme brightness of LEDs might cause a slight blooming effect," it is evident in the darker scenarios.