hi dcd
stool tests can check for undigested fat in the stool if needed - maybe something covered by regular insurance over there
but sounds like it might well be the cause
this paper talks about
dose ranges for lipase in steatorrhoea
However, many evidences suggest that a minimal dose of 25 000–50 000 U of lipase per meal is generally required to reduce steatorrhoea to <15 g fat per day in adults https://www.ncbi.nlm.nih.gov/pmc/articles/pmc4923703/note lipase is permanently degraded by low pH environments - so enterically coated products are needed
this paper is interesting as it documents clinical standard of care for steatorrhea due to chronic pancreatitis with a flow diagram
https://www.researchgate.net/figure/current-standard-enzyme-treatment-of-steatorrhea-in-chronic-pancreatitis-reproduced-with_fig2_26767312perhaps its just a phase the gut is going through as it adapts to the new diet and with a nudge in the right direction it can sort itself out