IntelliJ IDEA fails to launch Gluon Scene Builder

OS Info:

 OS: Manjaro 20.0 Lysia                                                                                                                                      
Kernel: x86_64 Linux 5.4.33-3-MANJARO 
Uptime: 22h 12m 
Packages: 1418 
Shell: bash 5.0.16 
Resolution: 3840x1980 
DE: KDE 5.69.0 / Plasma 5.18.4 
WM: KWin 
GTK Theme: Breath-Dark [GTK2/3] 
Icon Theme: breath2 
Disk: 35G / 104G (36%) 
CPU: Intel Core i7-6700HQ @ 8x 3.5GHz [41.0°C] 
GPU: Mesa Intel(R) HD Graphics 530 (SKL GT2) 
RAM: 5394MiB / 15876MiB

IntelliJ info:

IntelliJ IDEA 2019.3.4 (Community Edition)
Build #IC-193.6911.18, built on March 28, 2020
Runtime version: 11.0.6+10 amd64
VM: OpenJDK 64-Bit Server VM by Oracle Corporation
Linux 5.4.33-3-MANJARO
GC: ParNew, ConcurrentMarkSweep
Memory: 1917M
Cores: 8
Registry: 
Non-Bundled Plugins: 

Gluon Info:

Product Version
JavaFX Scene Builder 11.0.0

Build Information
Version 11.0.0
Date: 2019-03-19
Java Version: 11.0.1+13-LTS, Oracle Corporation

Logging
The default configuration stores logging output in a file named scenebuilder-11.0.0.log (possibly followed by a trailing '.' and a digit).
The default file path is /tmp/scenebuilder-11.0.0.log

Java
11.0.1+13-LTS, Oracle Corporation

Operating System
Linux, amd64, 5.4.33-3-MANJARO

Copyright (c) 2015-2018, Gluon.

Java Version:

openjdk version "11.0.6" 2020-01-14 
OpenJDK Runtime Environment (build 11.0.6+10) 
OpenJDK 64-Bit Server VM (build 11.0.6+10, mixed mode)

JavaFX Info:

Package: java11-openjfx

Version: 11.0.3u1-1

Build Date: 07/25/2019

Project Build.gradle:

plugins {
    id 'application'
    id "org.openjfx.javafxplugin" version "0.0.8"
}

group 'edu.iastate.csm'
version '0.1.0'

sourceCompatibility = 1.8

repositories {
    mavenCentral()
}

javafx {
    version = "14"
    modules = ['javafx.controls', 'javafx.fxml']

}

dependencies {
    testCompile group: 'junit', name: 'junit', version: '4.12'
}

application {
    mainClassName = "edu.iastate.csm.Main"
}

MainWindow.fxml:

<?xml version="1.0" encoding="UTF-8"?>

<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>

<AnchorPane xmlns="http://javafx.com/javafx"
            xmlns:fx="http://javafx.com/fxml"
            fx:controller="edu.iastate.csm.MainWindow"
            prefHeight="400.0" prefWidth="600.0">

</AnchorPane>

Problem:
When I open MainWindow.fxml in Scene Builder through IntelliJ, I get the following:

java.lang.ClassNotFoundException: javafx.embed.swing.JFXPanel

java.lang.NoClassDefFoundError: javafx/embed/swing/JFXPanel

Opening in Scene Builder manually (eg. without IntelliJ running) works perfectly fine.