prefect Inconsistent task run bar coloring

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Bug summary

Task run bars at times display with gradients, at times with opacity, and at times with translucence.

Reproduction

This script will produce gradients

from time import sleep
import random
from prefect import flow, task


@task
def tree(time=0.5, dependencies=None):
    sleep(time)
    return random.random()


@flow
def my_flow():
    layers = 6
    trunk = tree.submit(time=1)
    for l in range(layers):
        t = trunk
        size = 10 * (layers - l)
        layer_tasks = []
        for _ in range(size):
            time = 8
            t = tree.submit(time=time - l, dependencies=trunk)
            layer_tasks.append(t)
        trunk = tree.submit(dependencies=layer_tasks)


my_flow()