SUMMARY
My expectation of 'extension aware' file numbering would be that when selected, if I have a RAW and JPEG pair of files, each file would get the same numeric sequence.

When I check this option, instead each file is given a new number.

Is this the expected result?


STEPS TO REPRODUCE
1. Select a number of images. Go to Item >> rename
2. Enter the format of name in my case I started with a date, then wanted to put a number after it
3. Press Number...
4. Select Extension Aware Naming, press OK
5. The format of the name for batch looks something like: [date:"yyyyMMdd_"]###[e]   .... where the [e} is supposed to represent extension aware.

OBSERVED RESULT
A pair of RAW+JPEG (same image, different file type) has a DIFFERENT unique name. e.g. 
20200810_012.RAF
20200810_013.JPG

EXPECTED RESULT
Files of same image, different type should be like this:
20200810_012.RAF
20200810_012.JPG


SOFTWARE/OS VERSIONS
Linux: 7.1.0 Flatpak (ubuntu)


ADDITIONAL INFORMATION