Hi ,
I am using AEM6.3
Below is the touch ui dialog which is having the issue for fieldDescription and i have also pasted the dialog details.
Please provide inputs as how this could be resolved

<?xml version="1.0" encoding="UTF-8"?>
<jcr:root xmlns:sling="http://sling.apache.org/jcr/sling/1.0" xmlns:granite="http://www.adobe.com/jcr/granite/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="dialog"
sling:resourceType="cq/gui/components/authoring/dialog">
<content
jcr:primaryType="nt:unstructured"
sling:resourceType="granite/ui/components/coral/foundation/container">
<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">
<tab1
jcr:primaryType="nt:unstructured"
jcr:title="dialog"
sling:resourceType="granite/ui/components/coral/foundation/fixedcolumns"
margin="{Boolean}true">
<items jcr:primaryType="nt:unstructured">
<Configuration
jcr:primaryType="nt:unstructured"
sling:resourceType="granite/ui/components/coral/foundation/container">
<items jcr:primaryType="nt:unstructured">
<accordion1
jcr:primaryType="nt:unstructured"
sling:resourceType="granite/ui/components/coral/foundation/accordion"
variant="quiet">
<items jcr:primaryType="nt:unstructured">
<feedconfig
jcr:primaryType="nt:unstructured"
jcr:title="Tags "
sling:resourceType="granite/ui/components/coral/foundation/container"
maximized="{Boolean}true">
<items jcr:primaryType="nt:unstructured">
<taga
jcr:primaryType="nt:unstructured"
sling:resourceType="granite/ui/components/coral/foundation/form/autocomplete"
fieldDescription="These tags will show up on data for various Landing page in sample filter dropdown"
fieldLabel="Taga"
multiple="{Boolean}true"
name="./tagsRegion"
mode="contains">
<datasource
jcr:primaryType="nt:unstructured"
sling:resourceType="cq/gui/components/common/datasources/tags"/>
<options
jcr:primaryType="nt:unstructured"
sling:resourceType="granite/ui/components/coral/foundation/form/autocomplete/list"/>
<values
jcr:primaryType="nt:unstructured"
sling:resourceType="granite/ui/components/coral/foundation/form/autocomplete/tags"/>
</tagb>
</feedconfig>
</items>
</accordion1>
</items>
</Configuration>
</items>
</tab1>
</items>
</tabs>
</items>
</content>
</jcr:root>