While swimming underwater, every time your Y coordinate changes, your air bubbles flash and are completed refilled. It is almost like Minecraft thinks that there is air in between every water block
MC-48796
Unlimited Air Bubbles Underwater
Resolved
Duplicate
0
Duplicate of MC-48395 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.