Why .SECONDARY does not work with patterns (%) while .PRECIOUS does?

Thanks to Alex (see answer) i went further in my search.

What i found is that it is recorded in TODO.private of make project for 15 years ….

Using git://git.savannah.gnu.org/make.git you can see history of TODO.private content :

 6) Right now the .PRECIOUS, .INTERMEDIATE, and .SECONDARY
    pseudo-targets have different capabilities.  For example, .PRECIOUS
    can take a "%", the others can't.  Etc.  These should all work the
    same, insofar as that makes sense.

These should all work the same, insofar as that makes sense. but was not coded.

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