Just in case anyone has a similar issue and reads this: since it looked like FEAT has an issue with each voxel in the temp_filtered image having 0 mean intensity, I solved this by applying the following commands:
denoised_func_data_nonaggr.nii.gz -Tmean mean_denoised_func_data_nonaggr.nii.gz
fslmaths temp_filtered.nii.gz -add mean_denoised_func_data_nonaggr.nii.gz temp_filtered_with_mean.nii.gz
and was then able to complete Stats in FEAT.
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