[Venu 3s] some watch face metrics are not properly updated

I am facing an issue with multiple watch faces (installed from Connect IQ, 3rd party, but trustworthy) where some of the metrics are updated very infrequently or no value is displayed at all. Typically these watch faces display metrics natively, i.e. they are not "complications" but native configurable widgets in the watch face, which, I assume, uses direct SDK API access to read the data.

One metric that is updated very infrequently (once every 40-80 seconds) is stress level. Another metric that does not work at all is recovery time.
Heart rate is working all the time properly, being updated every second. 

Examples for watch faces that have these problems:

I have also tried several others, all seem to have the same issue.

Is this a known problem? Is it an issue with the Venu's firmware or maybe these watch faces need some adaptations for the Venu 3s?

Thanks!