
FYI, watchOS/iOS 26.6 beta 2 fixes the Apple Health Resting Heart Rate issues with third-party app data such as Athlytic
(This isn’t a bug report but I tagged it as such because it pertains to other “bug reports” on this issue.)
Turns out, as expected, this was an issue with Apple Health all along. Updating to the 26.6 releases should solve this issue.