I noticed that the boarding vehicles and other vehicles at night time would light up the amber light. But after doing the new installation and standalone manager the lights do not blink.
They do here...and nothing has changed with the latest version. The only change in the vehicle lights in the current version, is they automatically turn off their HEADLIGHTS (only), when they are not moving, to save performances with dynamic lights. But the flashing lights hasn't been changed since many versions.
Also I just noticed that the vehicle pulling the luggage is a cargo van instead of the typical tug van that normally pull his luggage.
The vehicle pulling the luggage cart has always been selected at random between three available, one open another one closed and a van, nothing has changed with the current version.
If the airplane door is lower than the minimum height reachable by the belt loader, no belt loader will come, and there will be just a van.
I have also seen that the vehicle pulling the luggage sometimes will only bring one carriage of luggage to a commercial airliner.
Since GSX has been released, the number of carts in the luggage loader is related to the airplane load so, either your airplane was empty, or it used some kind of progressive loading system, so it was still too light the moment you called GSX.