Hey Jullien,
I have just tested this using the Vive and 4.9.2 and I did run into the same issue as you reported. I have entered the following Jira ticket to track this issue and get it fixed.
UEBP-98 - [4.9] “Reset Orientation and Position” function has inconsistent behavior with HTC Vive
If you experience any more issues like this please be sure to let us know.