T-mobile 5G Home internet and VPN

I recently installed T-mobile 5G Home internet intending to replace Comcast Xfinity.  Installation was a breeze and I have the gateway/router setup at an ideal location in my home. I am getting download speeds on par with Comcast in my area (~200-230 Mbps) .  But once I logged into my work via VPN I noticed a significant downgrade in speeds.  I see downloads and uploads via VPN throttled way down (1-2 Mbps) compared  to without VPN.  I can confirm there are no bandwidth issues when the VPN is slow,  as I get very good speeds from a device that does not use VPN on the same setup.  

Also I still have my Comcast setup and when I switched my wifi to use the Comcast gateway I see speeds over VPN are more than 15X of what I see with T-mobile . So it looks like T-mobile is clearly throttling VPN traffic.  Everything else in the setup is the same (wifi,  target device, VPN network etc).  The only difference is the backend network (Comcast Vs T-mobile). I recall some mobile networks do this to prevent users from using their phones as a hotspot and log into work full time.  But this is unwarranted for a 5G home internet solution.