[Python] Saving .tif Image Incorrectly using Python3 and imageio

I am trying to save an altered z-stack .tif file in Python3. Here's my code where I checked that the the functions worked as intended.

#libraries
import imageio as ii

#import initial image
fname='101_nuc1syg1.tif'
adata = ii.volread(fname)

#check to make sure volread works
ii.volsave('temp.tif', adata)



Which results in this:



And now when I try to do a simple threshold, using the following code:

#now doing very simple thresholding
bdata = adata < adata[0].mean()

bdata = bdata +0

ii.volsave('temp.tif', bdata)


I get this:



Any idea how to save a tif file properly after performing image operators on it?

EDIT: Note that I am able to extract each stack and save them as separate .png files, but I would prefer to have them as a single .tif file.

Data from: https://www.nature.com/articles/s41467-020-15987-2

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