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Confused about missing fundamental data

I am trying to calculate growth in sales/revenue year over year. This works for a lot of stocks, but a bunch of non-junk stocks (e.g. El Pollo Loco or JUNO therapeutics), there seems to be missing data starting 5-6 quarters ago. I made this notebook to demonstrate the missing data.

Is this a problem with my implementation, or with morningstar's fundamental data? I tried adding or subtracting a few days to my "quarter length" without change

ex results:
quarter 5 q6 q7 q8
Equity(47382 [LOCO]) 8.655700e+07 8.690400e+07 NaN NaN
Equity(47414 [CTLT]) 4.183000e+08 5.196000e+08 NaN NaN
Equity(47430 [MBLY]) 3.467700e+07 3.365300e+07 NaN NaN
Equity(47752 [CDK]) 5.160000e+08 NaN NaN NaN

cant seem to get the results table to be in a readable fashion =/