v5.1.6 ignores pre-print calibration checkbox and printing always starts printing from 2nd layer - quasi-1st layer issue

[sq4nyy]

v5.1.6 does not start pre-print calibration, ignores checkbox and currently there is no way to the mesh to be re-done before printing like previously.

Slicer also always skips the first layer making it empty even in layer view, so starts printing from 2nd layer causing a quasi-1st layer issue and redundant z-offset

Tested with K1 Max with latest firmware.

[miiton]

I am also experiencing issues related to the 1st layer. In my case, the pre-print calibration works fine, but the first layer does not appear during the preview.

The attached screenshot shows the result of testing with the Test Model "Cuboid."