The blast power of TNT in 1.9 versions is buffed compared to previous versions such as 1.8.2 to 1.8.9 therefore making simple cannons overpowered in terms of range. It ruins the original blast power and distance of TNT cannons prior to 1.9 versions therefore causing confusion for cannoneers like me.

As can be seen in the pictures attached, the range of a a typical 3 charge cannon with a charge arrangement of 1-1-1 in 1.8.9 and below is 50 blocks. However in 1.9, the distance is increased by 60% compared to previous versions using the same cannon. The range of the cannon in 1.9 reached 80 blocks, 30 blocks more than 1.8.2 to 1.8.9.

For some of you, fixing this bug might not seem extremely important, yet there are servers that have been using TNT cannons for a long period of time and have accustomed to the using these cannons with their respective distances. I personally do not know if this is a bug or an intended change, but I very well know that this difference may cause many problems for TNT cannoneers like me who have been cannoning for more than 2 years. I sure do hope this bug can be fixed, or that the TNT blast power in 1.9 will be changed similar to previous versions in the past.

Below here is the test world for this experiment and pictures taken from the world are attached for reference.

UPDATE 3/31:

+Clarified cannon range between 1.8.0 and 1.8.2 to 1.8.9.
+Included cannon range and distance of versions 1.7.10 and 1.8.0.
+Added updated pictures that include versions 1.9, 1.8.2 to 1.8.9, 1.8.0, and 1.7.10.

I have now included the range and distance of the same TNT cannon in versions 1.8.0 and 1.7.10 in response to Kumasasa's comment. As can be seen in the picture, the range of cannons in versions 1.7.10 and below have the same range with cannons in 1.8.2 to 1.8.9 which is 50 blocks. In 1.8.0 however, the cannon blast power is reduced dramatically with the same cannon only firing 12 blocks. Therefore, this bug is unique or different to MC-66089.

Sincerely,
PJ