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This issue is more complicated than it seems at first. In an attempt to resolve an issue with the plymouth decryption screen not working on some new System76 models we are developing, we located a config setting that is defaulted to yes in the upstream configuration but which we have had set to no. Enabling that setting (SYSFB_SIMPLEFB) fixed the plymouth decryption screen on these new System76 models, and was regression tested on a wide set of other models with various graphics configurations as shown with the checkmarks in the PR you linked https://github.com/pop-os/linux/pull/177
Preventing regressions with kernel updates is difficult. To complicate matters, the fix for the regressions involved reverting a potential, but unverified, race condition fix. We are still searching for a better way to fix this regression. To complicate matters even more, there is an upstream Linux bug filed for this regression that has essentially gone ignored due to it being specific to NVIDIA GPUs, see https://bugzilla.kernel.org/show_bug.cgi?id=216303#c2 and https://github.com/NVIDIA/open-gpu-kernel-modules/issues/341.