group profiles__APPEND/PREPEND not working?

[andreymal]

I'm trying to use config v2 to split my profiles into multiple files and combine them to one group using profiles__APPEND. A simplified example of what I'm trying to do:

# profiles.yaml
version: "2"

groups:
  all:
    profiles:
      - profile1

includes:
  - profile*.yaml

profiles:
  profile1: {backup: {source: .}}

# profile2.yaml
version: "2"

groups:
  all:
    profiles__APPEND:
      - profile2

profiles:
  profile2: {backup: {source: .}}

According to the JSON schema, both files are valid and profiles__APPEND is a valid key.

However:

$ resticprofile profiles
2025/01/21 21:23:00 using configuration file: profiles.yaml

Profiles available (name, sections, description):
  profile1:  (backup)  
  profile2:  (backup)  

Groups available (name, profiles, description):
  all:  [profile1]

profile2 is present but not added to the all group.

I tried different versions back to 0.16.1 but this configuration doesn't work with any version I tested.

Is this even supposed to work? Or is this just a mistake in the JSON schema?