Thanks for posting the code, it confirms GrandFather's suggestion; using my advice from here to use Devel::Peek to inspect $dec, it shows:
SV = PV(0x571d5fd57c40) at 0x560d5ed7d9a0
REFCNT = 1
FLAGS = (POK,IsCOW,pPOK)
PV = 0x571d5fe15180 "QeTEv2804\0\0\0\0\0\0\0"\0
CUR = 16
LEN = 18
COW_REFCNT = 0
As per the Crypt::Rijndael docs, the blocksize for Rijndael is 16 bytes.
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