When using User=%i with a specifier, the result doesn't seem to propagate to other specifiers used within the unit such as %h.

For example [email protected]

...

[Service]
User=%i
Environment=XDG_CONFIG_HOME=%h/local/cfg
Environment=XDG_DATA_HOME=%h/local/data
Environment=XDG_CACHE_HOME=%h/local/var/cache
...

After this change inspecting (systemctl show) an instantiated unit such as user@1000 reports the following environments:

...
Environment=XDG_CONFIG_HOME=/root/local/cfg XDG_DATA_HOME=/root/local/data XDG_CACHE_HOME=/root/local/var/cache
...

I would have expected the expanded User= to also correctly expand %h according to that user's home directory.