AW5 GPS accuracy with LTE enabled

I am running with my AW5 cellular and noticed that when LTE (cellular) is enabled, I sometimes get very strange hiccups and glitches on the recorded GPS track. I am running with my Apple Watch alone, leaving the iPhone at home. Before starting, I ensure that my Apple Watch is disconnected from my iPhone to be sure that the GPS is used from the AW and not iPhone.

My watch is calibrated and the results are more or less random. I do not experience the glitches at every run with LTE enabled but I had no glitches ever (mostly perfect results) when LTE was disabled. It does not matter which workout app I am using, I get these strange hiccups with all of them (Apple workouts, iSmoothrun, WorkoutDoors).

A typical glitch looks like this:

I raised a support ticket at Apple for this, but there is nothing happening so far.

There are other user discussing this problem here in the Macrumors forum: https://forums.macrumors.com/threads/aw5-lte-gps-accuracy-problem.2201753/

Anyone else with the same issue?