It's not a bug. I don't know if it was intended or if it is just WIP, but Spencer really doesn't have many face emotions from that point. Who knows, maybe it will be added in the future with some route polishing and a new ending for this character, or maybe this is how the author conveys the secrecy of Spencer's nature ¯\_(ツ)_/¯
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I am diving deep into Harold's route and trying to notice these moments. But I just started getting acquainted with RenPy and coding in general. And with a poor knowledge in English and programming and with a lack of free time, it is difficult to browse through someone else's code. But I try my best to collect data at least for Papa Bear from beginning to the end credits. Only with the effort of the entire community this can be fixed. And I believe that someday it will happen. It's just not a high priority for Dyne to pay attention to right now.