RTE dialog field not working in 6.3.3

I'm having a very similar issue to this thread that was closed with no resolution: RichText not working for touch UI AEM 6.4

In my local instance (6.3.0), the rich text editor is working fine in my custom component but in 6.3.3 it won't even allow me to add anything to the field or show any of the plugins. In 6.3.3 there is an "Uncaught ReferenceError: $this is not defined" console error.

6.3.0

6.3.3

6.3.3 console error:

This is the dialog.xml:

<?xml version="1.0" encoding="UTF-8"?>
<jcr:root xmlns:sling="http://sling.apache.org/jcr/sling/1.0" xmlns:cq="http://www.day.com/jcr/cq/1.0" xmlns:jcr="http://www.jcp.org/jcr/1.0" xmlns:nt="http://www.jcp.org/jcr/nt/1.0"
    jcr:primaryType="nt:unstructured"
    jcr:title="Button"
    sling:resourceType="cq/gui/components/authoring/dialog">
    <content
        jcr:primaryType="nt:unstructured"
        sling:resourceType="granite/ui/components/coral/foundation/container"
        margin="{Boolean}true">
        <items jcr:primaryType="nt:unstructured">
            <tabs
                jcr:primaryType="nt:unstructured"
                sling:resourceType="granite/ui/components/coral/foundation/tabs"
                maximized="{Boolean}true">
                <items jcr:primaryType="nt:unstructured">
                    <quote
                        jcr:primaryType="nt:unstructured"
                        jcr:title="Quote"
                        sling:resourceType="granite/ui/components/coral/foundation/container"
                        margin="{Boolean}true">
                        <items jcr:primaryType="nt:unstructured">
                            <text
                                jcr:primaryType="nt:unstructured"
                                sling:resourceType="cq/gui/components/authoring/dialog/richtext"
                                fieldLabel="Item Description"
                                name="./text"
                                useFixedInlineToolbar="{Boolean}true">
                                <rtePlugins jcr:primaryType="nt:unstructured">
                                    <format
                                        jcr:primaryType="nt:unstructured"
                                        features="*"/>
                                    <misctools
                                        jcr:primaryType="nt:unstructured"
                                        features="specialchars">
                                        <specialCharsConfig jcr:primaryType="nt:unstructured">
                                            <chars jcr:primaryType="nt:unstructured">
                                                <copyright
                                                    jcr:primaryType="nt:unstructured"
                                                    entity="&amp;#169;"/>
                                                <trademark
                                                    jcr:primaryType="nt:unstructured"
                                                    entity="&amp;#8482;"/>
                                                <registered
                                                    jcr:primaryType="nt:unstructured"
                                                    entity="&amp;#174;"/>
                                                <emDash
                                                    jcr:primaryType="nt:unstructured"
                                                    entity="&amp;#8212;"/>
                                                <pound
                                                    jcr:primaryType="nt:unstructured"
                                                    entity="&amp;#163;"/>
                                                <nbsp
                                                    jcr:primaryType="nt:unstructured"
                                                    entity="&amp;#160;"/>
                                            </chars>
                                        </specialCharsConfig>
                                    </misctools>
                                </rtePlugins>
                                <uiSettings jcr:primaryType="nt:unstructured">
                                    <cui jcr:primaryType="nt:unstructured">
                                        <inline
                                            jcr:primaryType="nt:unstructured"
                                            toolbar="[format#bold,format#italic,format#underline,#justify,#lists,subsuperscript#subscript,subsuperscript#superscript,links#modifylink,links#unlink,links#anchor,#image,findreplace#find,findreplace#replace,spellcheck#checktext,misctools#specialchars,misctools#sourceedit,#styles,#paraformat,table#table]">
                                            <popovers jcr:primaryType="nt:unstructured"/>
                                        </inline>
                                    </cui>
                                </uiSettings>
                            </text>
                        </items>
                    </quote>
                </items>
            </tabs>
        </items>
    </content>
</jcr:root>

Any ideas of how to fix?

Thanks!