The documentation says (emphasis added):
There are also special extensions for certain fields so that placement can be targeted at specific field instances.
Does certain fields include the DateTime, Link, and Input fields?
I am trying to hide a DateTime field named Date when it is within a NewsItem content type. Here is my placement.info. Importantly, this placement.info works from a theme but not from a module.
<Match ContentType="NewsItem">
<!--These ones do not work.-->
<Place Fields_Input="-" />
<Place Fields_DateTime="-" />
<Place Fields_DateTime-Date="-" />
<Place Fields_Link="-" />
<!--These ones do work-->
<Place Parts_Title="-" />
<Place Parts_Common_Metadata="-" />
<Place Fields_Common_Text="-" />
<Place Parts_Common_Body="-" />
<Place Parts_Common_Body_Summary="-" />
<Place Fields_MediaLibraryPicker="-" />
</Match>
Here is Shape Tracing Model for one of the Fields: