We are using Fild Maps for our projects.
Since updating from 21.3.x to 22.3.0 the labels in some maps are no more visible.
In Arcgis online, Collector or devices with Field Maps prior 22.3.0 they are visible.
We don´t use offline maps.
To me i seems the update messed it up.
in our project we encounter this problem as well and since we actually need labels for fieldwork, manually searching for labels through editing each feature costs a lot of time and money! @esri: Please fix this issue as soon as possible.
Additionally, I found that if you have labels turned on in ArcGIS Pro, and publish the service layer from Pro, the labels will show up in field maps. Any labelling settings you set in the webmap will be honoured in the webmap, so you don't need to worry about them being perfect before publishing the service layer.