Eloquent subscribers with SystemDefaultsQoS missing messages

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I started building and testing (and blooming) one of my packages for eloquent. Compared to the same code in dashing, one of the subscribers seems to miss messages now (which I can see being communicated, using ros2 topic echo). Did the SystemDefaultsQoS change between dashing and eloquent in a way that would justify this behaviour?

I am building the system_modespackage in a Lubuntu 1804 development setup (ROS 2 from sources). The subscriber in question is this one: https://github.com/micro-ROS/system_m... which is missing single parameter events from events that come in bursts.