Collection of common port issues

Trying to get a list together of common port issues which have been seen in the past and have been fixed or are still in need of a fix (maybe the fix is already known and it it just must be applied):

__Oberserved Problems?__
- Changing the debug name of a library, find_package broken: #6014
- Manually changing the name of a ~~library~~ / dll leading to the problems described in #6553
- Changing the exported symbols: #6043
- Wrong library linkage: #5543, #5540
- packageConfig.cmake in wrong directory: #4783
- package*.cmake different for release and debug and release version is overwritten by debug version: (probably also mentioned in #5543 or add a better reference)
- single configuration triplets fail because the portfile trys to install/copy files which do not exist in a single configuration build

__What should new ports always test?__
(after of course building successfully)
- Port\Package should be correctly be found by `find_package`
- Linkage of packages should be correct for debug/release (must also be checked in any generated target/config file)
- single configuration triplets (either release or debug not both)

Should I ping people for more visibility?

Please add comments so that I can extend the list (and some of you have probably more experience than me fixing ports).