Got the 14.13 firmware yesterday. Then Garmin Connect made it "My Preferred Training Device" and totally ignored the training load on other devices. A bike ride on the 1040, and my other devices updated the training load properly, 955, and Garmin Connect (including website) however, seems to do its own thing.
When you try to change your preferred device, Garmin marked the others as Partially compatible:
Primary Wearable
Your Primary Wearable is the device you wear most often. It will be the primary data source for capturing daily health metrics such as steps, stress and sleep.
Partially compatible devices do not support all features. Setting a partially compatible device as your Primary Wearable may impact the the accuracy of your training data.
Extremely frustrating. I set the 955 as Primary Wearable, does not help.