Thank you @Gang . Yes, both factors only have two levels. However the chi-square results do not survive the minimum cluster size (but yes, it does survive under a more lenient cluster-size threshold), whereas the -gltcode-based test does. What is the source of the difference between these results?
I also noticed this post with the same question:
and @Gang your reply seemed to suggest one can report either the chi-square or the z-test. However, in most papers, we noticed that people using AFNI 3dlmer report the chi-squared results to report interactions and main effects - hence we are a bit confused.