2.1.244 Part 1 Section 17.7.6, Table Styles
a. The standard does not specify how the tblLook affects the corner cell conditional formatting.
In Word, corner cell conditional formatting is applied only if both of the corresponding first or last row or column are enabled.
b. The standard specifies that the resolved value of the toggle properties will toggle the previous level (True) or leave it unchanged (False) when present in a table style.
Word resets the value of the toggle property to the value specified by the table style if a value is present; for example, a value of 1 resets the property's state to True instead of toggling it.