Boolean simplify fails for a simple expression

Fails:

>> syms x y z
>> simplify(x & xor(y, z))
Error using mupadengine/feval (line 163)
The first argument must be a condition.
Error in sym/simplify (line 58)
rSym = feval(symengine, 'simplify', s,...

However, when xor is in root:

>> simplify(xor(x & y, z))
ans =
x & y xor z

[Nicolas Schmit]

I did not get a error when running your code in R2018a. Which version of MATLAB are you using?

[John Smith]

R2015a. Suppose I should update MATLAB or implement xor with "and", "or" and "not". I was hoping for something with lesser impact on the workflow, like patching the toolbox script, but thanks anyway!

[Walter Roberson]

Unfortunately there does not appear to be any simple patch in that release.