ending function in tests

Controlling the test results of odepkg

https://bitbucket.org/odepkg/odepkg/src/default/

with octave 5.2 on Cygwin I hit a strange error

***** end
!!!!! unknown test type!

the error is caused by ending functions with just "end"

%!function [ydot] = pendulum (vt, vy)
%!  ydot = [0.5*vy(length(vy)/2+1:end); 
-(2*5*9.806)*[zeros(length(vy)/4);ones(length(vy)/4)]];
%!end

of course replacing

    %!end
with
    %!endfunction

works, but also declaring a normal function with "end" works

function [ydot] = pendulum (vt, vy)
    ydot = [0.5*vy(length(vy)/2+1:end); 
-(2*5*9.806)*[zeros(length(vy)/4);ones(length(vy)/4)]];
end

as this maintain compatibility with Matlab.
Is this by design or should I open a bug ?

Regards
Marco