You could each add a post with -1 karma to FEDORA-2025-0341e0131a — bugfix update for kernel and kernel-headers — Fedora Updates System and briefly describe your symptoms there and let them know if you found other pages/people who describe the same issues with 6.14.2 not solving them.
Since the kernel is already in stable, it is not sure if the maintainer still reviews new posts there, but it might be worth a try to give the maintainer the possibility to become aware of it (if not already happened).
If you can test the next kernel early when it enters testing stage (so once it is in bodhi and a yellow-backgrounded dnf command is shown on the page - that yellow-backgrounded command usually shows up some hours or about a day after the page shows up), and then provide a feedback early in its then-existing bodhi page, including a link to your elaborations here (which then might also contain cases of others). That might give the maintainer early the possibility to become aware of the issue, but keep in mind the issues and considerations I mentioned about getting a new kernel as long as it is not pushed to stable here.
If you create a bug report, which might be a good idea if 6.14.4 does not solve the issue, you might also add the links you found on other pages about the case (beyond what I already elaborated in the other post about what to contain in a bug report and what to consider when creating one). Also, in a bug report, add links to upstream issues (such as the drm/amd case you seem to have already found) and other Linux distribtion issue tickets that are about the same case → helps to keep all available knowledge and data about the case together, and avoid double work, but also make clear if it is a wider phenomenon.
Also, I added the kernel tag as this is potentially/likely a kernel issue.
Unfortunately, I cannot invest much time the next days 
But I hope 6.14.4 already solves the case!
Supplement: the new bodhi page for 6.14.4 was just created: FEDORA-2025-a8f47ee8b3 — bugfix update for kernel — Fedora Updates System (that’s the page for F42 only)
Here are the fixes that the new kernel introduces; maybe something can be linked to your issue? → kernel-6.14.4-300.fc42 | Build Info | koji