I don’t think tech support would be able to detect the left and right sides of the solar, and hence they wouldn’t have a reason to change it (since they are almost always very close to each other)
Reversing the direction of the labels (and even opposite directions for the left and right sides) are states that should be able to be automatically detected, but it seems as tech support is doing it manually.
E.g. This is the technique I would use in programming.
With Solar on and Solar off during a sunny day, both solar sides should be positive when on, and close to zero when off. If when Solar is on, either side was negative, the software could mark the direction of each Solar CT.
Similarly, when Solar is off, if either Mains CT was negative, then that Mains CT is reversed, and that CT value can be reversed.