In two cases the percentage property was actually used incorrectly, as
pointed out in T82070. The range was [0, 1], but the properties were still
displayed as percentages.
There is a preference to control whether to display factors or
percentages, so it usually doesn't make sense to manually define
properties as percentages.
Resolves T82070
Differential Revision: https://developer.blender.org/D9344