The atum template hides the field description configured in the manifest file, instead of displaying them to the user as tooltip.
This is bold as extension developers use this tag to give further information/instruction on a field to users.
That way the template just drops possibly important information for the user.

Sample code produced by the atum template:

<div class="control-group">
	<div class="control-label">
		<label id="jform_params_myfield-lbl" for="jform_params_myfield" class="required">
			My field label<span class="star" aria-hidden="true">&nbsp;*</span>
		</label>
	</div>
    <div class="controls">
		<input type="text" name="jform[params][myfield]" id="jform_params_myfield" value="" class="form-control required" aria-describedby="jform_params_myfield-desc" required="">
		<div id="jform_params_myfield-desc" class="hide-aware-inline-help d-none">
			<small class="form-text">
				My field's description.
			</small>
        </div>
	</div>
</div>

Maybe in the the tag

aria-describedby="jform_params_myfield-desc"

is not handled properly.