"One mystery - there is a commented out call to delete_FP at line 24. If I don't comment this out, I get an error when I get to "print FP::subtest1()" on line 30, although the subsequent call to delete_FP seems to work fine - any ideas?"
Use FP->subtest1(), not FP::subtest1(). It's all about when the sub name is resolved to its implementation. Colons at compile-time; arrows at run-time. So FP::subtest1() gets bound at compile time to your original subtest1 function, but that gets destroyed when you delete the FP package. Even though you load a new subtest1 implementation, lines 30 and 40 are still bound to the original version of the function which has since disappeared.
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'
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