No data on breathing variations on Venu 3

Same here!

All,

Please see our recently released beta software for a fix addressing this report. If you prefer to not install this beta software, we hope to be rolling out a public software update soon, though I do not have a timeline for this release. If you are still seeing this issue after installing the beta software, please contribute your observations in the appropriate beta bug reports section of the beta forums for your specific device.

Enrolling in Garmin Beta Software Program

Important note about ECG App: Moving forward, the Beta software available for the Venu 3/3S will have the ECG feature disabled. If you would prefer to keep the ECG App feature accessible on your watch, we recommend not participating in the Public Beta program. The ECG App feature will be made available again on versions of beta software that we anticipate becoming Live updates. In other words, you will see the ECG feature become enabled again in Beta software toward the end of our quarterly beta cycles. The ECG App feature will remain available with Live software updates (on compatible watches). 

OK.  I presume this is the same as I can see in the app in the Sleep Score so that's good enough for now and I won't bother going with a Beta.