Description

Issue discovered by Leo Juhlin when running the example code for howto-spotfindingresults
"y-values of detected spots, shown in y-column all being 0, and the radius of the detected spots being extremely large."
This is an index shift error that was missed in #2064 and can be easily fixed.
Unfortunately, the fix brings us back to an old issue #1870 of running blobdetector without reference and is_volume=False, because the (X,Y) tile is now missing the z-axis which leads to IndexError: index 3 is out of bounds for axis 1 with size 3

This is also related to #1985

Steps/Code to Reproduce

Run the jupyter notebook and add the line:
spots[{Axes.CH:1, Axes.ROUND:0}].spot_attrs.data

Expected Results

Actual Results

Versions

Linux-5.15.153.1-microsoft-standard-WSL2-x86_64-with-glibc2.39
Python 3.9.22 (main, May 7 2025, 10:28:35)
[GCC 13.3.0]
NumPy 1.26.4
SciPy 1.13.1
scikit-image 0.24.0
pandas 2.2.3
sklearn 1.6.1
xarray 2023.8.0
sympy 1.14.0
starfish 0.3.3