Zebras only function at 400 ISO?

rmb

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So I noticed something interesting while doing so exposure tests that in DLog the zebras only seem to function at 400 ISO.

Example: If I am (for sake of argument) at 200 ISO at a 50th and an f11, that I can open up my Fstop till the screen becomes white (2.8) without sign of a single zebra bar. However, if I am at 400 ISO (not 100 or 200) that my zebras now function. Do you suppose that that is that some sort of a new “native ISO” thing?