2017~2021 Timing cover seal and coolant flange issue

Just an FYI that it's always much better for any problem discussion to just post on one thread. If there are separate conversations going on in multiple threads, the information is likely to not be shared as well as when it's all in one place. And IMO the thread that you started would be the best place for this discussion to continue.

However, if you eventually have an outcome that applies to discussions in multiple threads, and might benefit other readers, then it's certainly ok to post that information in all of those threads. JMO, based on spending time on many forums over quite a few years.
I believe these issues to be related but I see what you're saying.