The same thing that happened in the linked issue
JBSEAM-1937 is happening again. This time it is only causing exceptions when evaluating a simple value expression eg. #
Looking through the code the problem is happening again in the org.jboss.seam.bpm.SeamExpressionEvaluator where it "Successfully" creates a MethodExpression and then tries to invoke it which causes a ELException which is not caught (only MethodNotFoundException is caught) and the call exits without trying to evaluate the expression as a ValueExpression.