Description: When depositing or withdrawing potions from a storage container, there is a brief white square around the item which lasts approximately 0.5-1 second. The square can be seen as the item "travels" from one container to the inventory, or vice-versa. It then lasts about 1 game tick after the item reaches its destination. This bug is repeatable and happens every time a potion changes inventories.

It has been tested and occurs on the following:
-Containers: Wooden chest, end chest, shulker box, hopper, brewing stand
-Potions: Water Breathing (8:00), Slow Falling (4:00), Swiftness (8:00), Night Vision (8:00), Fire Resistance (8:00), Fire Resistance (3:00)

It does NOT OCCUR with the following items when using the same procedures:

-Water Bottle

-Awkward potion

-Any other random item I have tested

Tested exclusively on:

Xbox One OS Version 10.0.19041.2494 (rs_xbox_release_2005.200522-1800)

Minecraft [Bedrock] v1.16.2.70 (June 23, 2020)

Note- I'm a hobbyist programmer myself, so I've tried to make this report as useful as possible. I hope this helps!

Thank you Dev/Debug teams, we love you!!!!  <3