[GAMEPLAY] Zyra's plants failing to properly attack

Occasionally, a bug occurs where Zyra's plants do not begin to attack nearby targets after being spawned. Here is an example that was given:

https://gfycat.com/SilverAbleCaterpillar

I went into the practice tool and was able to reproduce this bug consistently using the following steps:

1. Level up Zyra to 2, skill Q and W, and then go to a minion-free location (I tested this in lower river, right outside the dragon pit).
2. Spawn an enemy Target Dummy.
3. Use Q and W or Q and passive to spawn plants. The plants must be facing away from the target dummy, they must be slightly away from the dummy (about one Teemo's worth of units), and the dummy must not be hit by either the damage portion of Q or Zyra's autoattacks.
4. The visible marker used to indicate the priority target will appear to snap to the spawn location of Zyra's Q, and the plants will not attack.

My suspicion is that the plants are running on a default behaviour when they spawn with an invalid mark stored. In my reproduction, the mark appears to be sticking to an entity that then despawns (the Q cast entity), which renders the stored mark invalid. Any plants spawned in will attempt to call the mark, find that it's invalid, and therefore revert to their default behaviour, where they only begin to attack an enemy unit when that enemy unit comes into their cone of vision. Applying a mark while a plant is alive seems to reset the mark and causes the plants to begin to run their normal behaviour on subsequent spawns. I'm unsure if this "fix" is permanent over the duration of the game, or if this bug might reset (such as if Zyra dies).