Rebuilding a plan causes variables to fail substitution from deployment project

Plan Foo is linked to Deploy project Bar. Let's say build #123 is the next build.
Deploy project Bar has a Script task that references a plan variable of Foo, like echo ${bamboo.some.plan.variable.of.importance}

Scenario:

• Start building Foo 123.
• Cancel Foo Build 123.
• From Foo Build 123, run > rerun incomplete jobs
• Foo Build 123 completes successfully.
• From Deploy project Bar, run deploy on 123
• Bar 123's task does not substitute the value.

Workaround:

• Simply do not rebuild. If you start Foo 124, and do not cancel / rerun, Bar 124 will correctly have the plan variables accessible for substitution.

Of note:

• Global variables continue to be interpreted. It is only plan variables that are not present.
• The plan variable that fails substitution in the Bar deployment project is present on Foo 123's metadata tab.
• I am using the Maven POM value Extractor plugin, which may or may not have interaction with this issue. (It actively sets plan variables each run)