Thanks
@Clement
I think you didn't change one of the template versions in the new addon (1.0.x), it is still showing the old addon version number which was 3.0.x
The issue has been resolved by modifying the below file:
upload\src\addons\XFA\RMNodesLayout\_data\templates.xml
I replaced this:
<template type="public" title="xfa_rmcl_rm_categories.less" version_id="903000090" version_string="3.0.0"><![CDATA[.xfrm-icon
With this:
<template type="public" title="xfa_rmcl_rm_categories.less" version_id="901000090" version_string="1.0.0"><![CDATA[.xfrm-icon