"Failed to get variable ans" error, when not trying to get ans.

Using the string macro mat"" I frequently get "failed to get variable ans from MATLAB session" error. This happens even though I am suppressing Matlab output with ;. It happens in various situations, but this is the first reliably reproducible example I have been able to make:

Put this in a file Foo.m somewhere in your path:

classdef Foo < dynamicprops
end

Then run:

julia> using MATLAB

julia> mat"f = Foo();"
inary

julia> mat"addprop(f, 'bar');"
Error using save
Unable to save variable 'ans' of class 'meta.DynamicProperty' to STDIO.
 
ERROR: MATLAB.MEngineError("failed to get variable ans from MATLAB session")
Stacktrace:
 [1] get_mvariable(::MSession, ::Symbol) at /home/DNF/.julia/packages/MATLAB/cVrxc/src/engine.jl:164
 [2] get_mvariable at /home/DNF/.julia/packages/MATLAB/cVrxc/src/engine.jl:168 [inlined]
 [3] get_variable(::Symbol) at /home/DNF/.julia/packages/MATLAB/cVrxc/src/engine.jl:170
 [4] top-level scope at /home/DNF/.julia/packages/MATLAB/cVrxc/src/matstr.jl:169
 [5] include_string(::Function, ::Module, ::String, ::String) at ./loading.jl:1088

• The dynamic property 'bar' is successfully created.
• Why is the word 'inary' printed to output after creation of the object? This happens a lot.

MATLAB.jl v0.7.3
MATLAB Version: 9.8.0.1417392 (R2020a) Update 4

julia> versioninfo()
Julia Version 1.5.0
Commit 96786e22cc (2020-08-01 23:44 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: Intel(R) Core(TM) i7-10875H CPU @ 2.30GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-9.0.1 (ORCJIT, skylake)
Environment:
  JULIA_EDITOR = code
  JULIA_NUM_THREADS = 10

Reproduce the Foo.m example with the two mat"" commands, then inspect src/matstr.jl:169 and src/engine.jl:164-170, where the stack trace shows ans being fetched. Trace how suppressed expressions are handled and check the output path that prints "inary". Done means the commands complete without an ans error or stray output while still creating the dynamic property.