Revision 900 of the javanettasks project was supposed to fix a case sensitivity bug:
https://javanettasks.dev.java.net/source/browse/javanettasks/trunk/javanettasks/src/org/kohsuke/jnt/JNFileFolder.java?rev=900&view=log

For release 1.9 of the plugin, I just hacked my maven setup to use this patch. For 1.10 I tried to use the deployed versions of the libraries but ran into trouble again, so I need to sort out the maven dependencies to use the patch properly.

Release 1.10 of the plugin was never properly completed, which must be contributing to the problem here.

I sorted out the maven issue - maven-hpi-plugin had the version of javanettasks specified explicitly to 1.23, which is one short of the one needed. Once I updated that, I'm able to do a full release without problems.

Are you still seeing this issue with the configuration slicing plugin 1.13 or 1.14?

To upgrade from 1.9 on linux I had to delete the ConfigurationSlicing files from the plugin directory so the configurationslicing ones would be used. I thought this info might help some people. This issue sounds like this bug so I'm not opening a new one.

Should have been fixed by release 1.13.
Anyone upgrading from an old version will have to manually delete the old hpi file. But the latest version is 1.19, so hopefully few people are in that situation.