Hi Erik - thanks for the follow-up. Now I understand. You were testing automake-1.16.5. But you sent it so soon after we released a pretest, I didn't notice, and thought you were testing the pretest :).
These test failures (among lots of other things) are supposedly fixed in the current sources. Could you easily test https://alpha.gnu.org/gnu/automake/automake-1.16j.tar.xz ? No need to install it, just ./configure && make && make -j8 check; for whatever value of "8" you like :). --thanks, karl.