Dating back to [1] the behavior of expression resolution in the presence of partial expressions has been inconsistent.

This fails:

${partial

This returns "x" assuming system property "partial" exists with value "x"

${partial}${partial

Failing on "${partial" is reasonable since it can be escaped with "$${partial" if that string is wanted. Only failing sometimes is not correct though.

This is relatively minor as WFCORE's expression logic will deal with this, masking the problem in DMR.

[1] https://github.com/jbossas/jboss-dmr/commit/b9ae2704cf17e5e4b83987f2e9cafeed122c6327#diff-5119e19171d724f6be0e6031de4bcb15L222