Yesterday finished a match, where the spring tile seperated the field (farm)
So i found Big Box Style V1. 2 (3.7):
"Officially, the farm goes around the spring. So it is a connected farm. This has been incorporated in the RGG of The Big Box, which includes The River (the HiG edition does not) and states that "The field space on the lake and spring tiles wraps around features."
Also the same rules are using Latvian Forum of Carcassonne and in some other Forums in Internet says the same.