Indeed it is.
When migrating from .NET Framework 4.81 to .NET 8.0, I did notice something strange. Some TrsSite elements were not downloading correctly. I made the following tweak to my copy of the SOAP schema to fix (see italics):
<xsd:element name="zoneNumber" type="xsd:int" default="0" />
<xsd:element name="zoneDescr" type="xsd:string" default="" />
I have no idea why this was fine before but broke on newer libraries. It was easy enough to work around.