Errors in Sentinel 1 Processing in Python after preprocessing in S1Tbx

I am preprocessing Sentinel 1 GRD data in SNAP for a change detection algorithm written in Python. I stack two images from different dates (same orbit).

My current preprocessing chain is:

Terrain Correction - Radiometric Calibration - Coregistration (Stack) - Speckle Filter - Subset

I am exporting the file as a GeoTiff and then using that as input in the script tool, but am getting the following error:

This error has not always occurred, so I would be very grateful for any insight on this issue!
Thanks in advance!

Please try saving in BEAM-DIMAP and exporting to GeoTIFF in a separate step.

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