Super Brainz's Heroic Fists hit target, but don't register damage

Product: Plants vs. Zombies: Battle for Neighborville
Platform:Sony Playstation 4
Please specify your platform model. Sony PlayStation 4
Please provide your Xbox gamertag or PSN ID. (Optional)
In what game mode did the bug occur? Everywhere
Summarize your bug Super Brainz's Heroic Fists don't do any damage, despite showing a damage number and playing the punch sound effect.
Steps: How can we find the bug ourselves? It's kinda hard to replicate the bug, it just happens by itself. It usually happens in a Team Vanquish or Turf Takeover game, when your crosshair isn't directly on the enemy and you use your Heroic Fists. It'll usually show a damage number, but won't actually do any damage.
How often does the bug occur? Often (50% - 99%)

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I'm finding that Super Brainz's punches don't always land on an opponent, despite the game saying you did. Quite often, I will attempt to punch a plant, and despite showing the damage number and hearing the *whack* sound effect, it doesn't actually do any damage. This makes Super Brainz really frustrating, because I often lose 1v1s due to false damage output, when they should clearly be vanquished.

Here's some video evidence I put together from my own gameplay.