Text is a valid tag in SVG, and the plugin absolutely mangles them:
The issue is replicable by having inline SVG in any file that will be parsed by docpad while this plugin is enabled. Text will disappear in the SVG.
Released text plugin v2.3.0. Set the plugin's configuration option matchElementRegexString to t and that way it will only use and look for the <t> element instead of the <text> element as well. Documentation for this is now included in the readme too.