Dragging formula no longer skips hidden cells

[kanight]

I know for a fact that as of one month ago my version of Excel (2016 MSO 32-bit) would skip hidden rows if I dragged down formatting or formulas. However, this morning I was working on a project and I dragged down a few formulas and the hidden rows were changed as well. Did Excel change something? Did I inadvertently change a setting? Thanks in advance for the help!

[CK76]

I'd guess, that when you previously performed drag down operation, you had Autofilter to filter out specific rows.

When autofilter is used to filter out specific rows, those rows are ignored in drag down operation.
However, if these rows are manually hidden, it will overwrite with dragged value/property, even when hidden.