Firstly, issue #153175 refers to the "time of day" sensor, which is not what you're using - you're using the "time" trigger. The TOD code does a bunch of timezone acrobatics that can be fixed, but I don't think it'll affect your problem.

Secondly, I built a tiny regression test on dev (on top of 333a3421) to reproduce your problem, and it didn't repro. I created a "trigger: time, at: 06:00:00, Europe/Paris", attached it before the DST transitions, and checked when it fires before, during, after the DST actual. The trigger fires perfectly on 06:00 walltime, and adjusts utc to match.

Thirdly, the HASS UI has a small bug where it shows "Paris/+1" even if it's currently DST. It's a UI bug only, but it can lead to someone thinking that the entire HASS core doesn't respect DST.

Silly tech support questions - are you on latest? Did you try playing around with {{now()}} in developer templates? Maybe open a new issue?