Well... I rotated the saddle back to the default/original position.
I can't explain to myself why but now the guide calibration after the flip works correctly.
I only tried once though.
Assuming that my issue is now solved just two questions:
-- why it matters if the saddle rotated 90 degrees?
-- I rotated the saddle more that a year ago and I am certain this configuration worked just fine until sometime in the second half of last year.

Thanks!


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