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

Question

My question is to understand better what i missed in make process and .SECONDARY purpose vs .PRECIOUS, not to get my script working, since it does work already.

I am

Answer 1

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.

Answer 2

The answer to "Why .SECONDARY does not work with patterns (%) while .PRECIOUS does?" is here: the document says

You can also list the target pattern of an implicit rule (such as ‘%.o’) as a prerequisite file of the special target .PRECIOUS

but does not say this about .SECONDARY. But for the few explicit exceptions, none of the special targets accept patterns.