DM-8088 changed makeCoaddTempExp so that the user no longer has to specify the pixel dimensions of the model PSF to match to. The model Psf dimensions are updated at runtime to match those of the warped calexp PSFs (which have dimensions impossible for a user to know ahead of time).
AssembleCoadd currently attaches the PSF corresponding to the user-specified model PSF dimensions rather than the updated PSF-dimensions. This is bad because the user-specified dimensions could be way off and it's incongruous to tell users that they don't have to pay attention to this in makeCoaddTempExp, but they do in assembleCoadd.
This ticket will ensure that the modelPsf dimension information flows down from the coaddTempExps to the assembled deeepCoadd in a sensible way. Most likely using the maximum dimensions of the input coaddTempExps.