Original file extension unexpectedly added back

[myghubusername]

Problem description

I try to:

1. Capture any new file in a source folder (e.g. backup.json)
2. Add a .jpg extension to it (e.g. backup.jpg)
3. Copy that new file to another folder

The file is successfully copied but looks like backup.jpg.json instead of backup.jpg

Reproduction steps

I try to:

1. Capture any new file in a source folder with regex template ^(.+)$ -> e.g. backup.json
2. Add a .jpg extension to it with regex template $1.jpg -> e.g. backup.jpg
3. Copy that new file to another folder

Also, in the app it specifically says that for regex template $1.jpg "Template will yield backup.jpg"

Expected behavior

I expect the behavior the app itself describes: "Template will yield backup.jpg", i.e. backup.jpg in source folder -> backup.jpg in destination folder

Screenshots and logs

No response

Additional context

Nothing more, but feel free to ask for clarification. Great app otherwise