React-Native-Canvas doesn't draw whole rectangle

While making another app, I ran into a problem react-native-canvas, so I created this minimal project. The problem is that the WebView is much smaller than the Canvas and doesn't fill the entire canvas when appropriate. Here is the code (very similar to the example code ):

import React, { Component } from 'react';
import { View } from "react-native"
import Canvas from 'react-native-canvas';

export default class App extends Component {

  handleCanvas = (canvas) => {
    const ctx = canvas.getContext('2d');
    ctx.fillStyle = 'purple';
    ctx.fillRect(0, 0, 350, 700);
  }

  render() {
    return (
      <View style={{
        width: 350,
        height: 700
      }}>
        <Canvas ref={this.handleCanvas} style={{
          width: 350,
          height: 700,
          borderWidth: 1,
          borderColor: "red"
        }} width={350} height={700} />
      </View>
    )
  }
}

Here's a screenshot of the app: as you can see, the code should not render the rectangle to the full size of the canvas (marked in red), it does. According to the Expo Inspect-Element debugging tool, the WebView (ie the entire rectangle) is only 300 x 150 pixels.

Am I missing something obvious? Or is this a bug's bug react-native-canvas?

This is on Android by the way.