It seems to get fixed in 3.1+ version but, not in OpenCart 3.0. I’ve just created file, named mod-fixes.vqmod.xml and placed in /system directory, have been tired to create install for every POS. I’m going to to post more changes I’ve added to this file.
<?xml version="1.0" encoding="utf-8"?>
<modification>
<id><![CDATA[MODS/FIX for OpenCart 3]]></id>
<version>3.0.3.2</version>
<vqmver>2.5.1</vqmver>
<!-- ups fix -->
<file name="catalog/model/extension/shipping/ups.php">
<operation error="skip">
<search position="replace">
<![CDATA[
if ($this->config->get('ups_' . strtolower($this->config->get('shipping_ups_origin')) . '_' . $code)) {
]]></search>
<add>
<![CDATA[
if ($this->config->get('shipping_ups_' . strtolower($this->config->get('shipping_ups_origin')) . '_' . $code)) {
]]>
</add>
</operation>
</file>
</modification>