Making 192 open image tabs really? How was this not thought when making the feature ?
AI says use ofn-guillotine-layer - trying it but again take this more as QoL - feature suggestion. obviously has to be improved. I am posting this as something that I may need to use other times too.
The Gimp 3 that may be able to do this is
https://sourceforge.net/projects/gimp3-tools/files/general/ofn3-layer-tiles.zip/download