Here are the versions...
system-user-grommunio-9-1.6.noarch
grommunio-admin-common-38.f4553bd-24.7.noarch
system-user-gromox-9-4.4.noarch
gromox-2.30.60.gcef3d09-40.1.x86_64
grommunio-error-pages-1.0.10.bb2df37-10.19.noarch
grommunio-common-26.a6f127d-39.10.x86_64
grommunio-sync-2.0.118.50eef70-169.2.noarch
grommunio-admin-web-3.1.0.31.aff32dc-104.1.noarch
grommunio-antispam-3.9.0-1.4.x86_64
grommunio-web-3.9.28.g5530dc69-102.1.noarch
grommunio-admin-api-1.15.21.b74d52b-110.1.noarch
This runs on a RHEL 9.4. MacOS is still 12.7.5 (Monterey, x86) mail.app is 16.0 (3696.120.41.1.8) and MacOS 14.5. (Sonoma, Apple Silicon) mail.app is 16.0 (3774.600.62).
btw. I downloaded the latest src.rpm to double check that the patch is in.
Error is still: /usr/include/c++/11/optional:439: constexpr _Tp& std::_Optional_base_impl<_Tp, _Dp>::_M_get() [with _Tp = gromox::EWS::Structures::sFolderSpec; _Dp = std::_Optional_base<gromox::EWS::Structures::sFolderSpec, false, false>]: Assertion 'this->_M_is_engaged()' failed