On another computer running 8.8.beta6, I get no problem.
$ sage --version
SageMath version 8.8.beta6, Release Date: 2019-05-22
$ sage -t arXiv_1906_01104.rst
Running doctests with ID 2019-06-20-20-18-43-d5a5294b.
Git branch: 26552
Using
--optional=build,cbc,ccache,cryptominisat,dochtml,dot2tex,e_antic,glucose,memlimit,normaliz,notedown,openssl,pandoc_attributes,pycosat,python2,rst2ipynb,sage
Doctesting 1 file.
sage -t --warn-long 70.5 arXiv_1906_01104.rst
[41 tests, 15.12 s]
----------------------------------------------------------------------
All tests passed!
----------------------------------------------------------------------
Will try with a fresh installation of 8.8.rc2 on both of my computer now.
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