I was using MixedModels#master as in
(@v1.4) pkg> add MixedModels#master
It seems that the coefficients are properly estimated but the standard deviation of the random effects and the standard errors are incorrect. @palday Do you recall if there was an issue related to weights in the released version v2.3.0? You have been doing much more on GLMMs while I have been down the automatic differentiation rabbit hole.