sts debugging unable to find groovy source when debugging remote application

Unable to get debugging of remote groovy classes working when debugging is remote. Clicking on a groovy script and selecting debug as script does work as expected.

However, defining a spring bean in a spring mvc application with syntax along the lines of

<lang:groovy id="foo" refresh-check-delay="10000"
script-source="classpath:com/foo/Foo.groovy" >
<lang:property name="bar"><value>bar</value>
</lang:property>
</lang:groovy>

and putting a breakpoint in the groovy file, starting tomcat, and connecting with the debugger, it does stop at that breakpoint and all functionality seems to be there, but it can't find the source. Explicitly adding the directory with the source in it has almost no effect. I say almost because it does flicker briefly like it has the source, but then goes back to the "Source not found." page with the "Edit Source Lookup Path..." button.