New KMyMoney file saves with extra characters in filename

When I create and save a new file as XML using File|New, it results in a hidden file with extra characters. Ex., if I submit filename KMyMoneyHenry, the resulting filename will be something like
.xdp-KMyMoneyHenry.kmy-PfuiXC-fF39mr

I expected .xdp-KMyMoneyHenry.kmy

The new file seems to open and run fine. The full filename appears in the KMyMoney top banner.

Is this normal? I realize its a Gzip file, but all my searching indicates my file should end in .kmy

KMyMoney v5.1.3 Flathub, ZorinOS 17.2 Pro.