TNT exploding in water does not knockback players

Partner Rank:

1

Partner Team Reporting:

Pathway Studios

Verification builds and Platforms:

Minecraft-Release_UAP_x64_2693265 - 1.13.0.4 RC2

Summary:

TNT exploding in water does not knock players away from the explosion.

Impact:

This breaks the “Blast onto the bedrock” minigame in Ultimate Minigame Rush where players swim through water onto TNT and try to blast themselves upwards.

Repro Steps:

1. Download and open Ultimate Minigame Rush
2. /setblock 9 26 0 redstone_block
3. /kill @e[type=armor_stand]
4. /setblock 48 117 32 wool 0
5. Start game

Observed Results:

The blast onto bedrock minigame will load.  The player is not knocked away from the exploding TNT.

Expected Results:

The player is knocked away from the explosion.

Screenshot/Video?

Yes, attached.

Regression Builds:

1.10.0.7 RC2 (Minecraft-Release_UAP_x64_1846015)

Notes:

The bug occurs even if the player does not have the resistance status effect.  The player should be knocked back both with and without resistance.  An alternate way to reproduce the bug is as follows:

1. Create a new world
2. Dig a 1-block deep hole and fill it with water
3. Standing in the water summon lit tnt (/summon tnt)
4. Stand nearby and observe that the player is not knocked back by the explosion