Quadmesh creating ugly aliasing? effect

I have a xarray with an 3-dim spectrograph dataset with dimensions (spectral, spatial, samples).
Due to calibration efforts, the resulting wavelength values are not equidistant, which is why holoviews recommends to use quadmesh to plot the data.

However, doing so creates this ugly aliasing or moiree effect?

The option precise=True means switching to quadmesh.

Zooming in, one gets the impression that there might be gridlines involved?