I have exactly the same problem with Debian Stretch (testing) on amd64.
Package version is 232-15.
$ systemctl --version
systemd 232
+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP
+GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD +IDN
The system wakes, but the service unit won't be started. If the system
wasn't syspended then the timer service works as expected.
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