Guix re-installing already installed packages

[Tirifto]

Hello!

I installed TeXmacs using Guix on Parabola GNU+Linux-libre. TeXmacs is
already the newest version (1.99.11) and whenever I run ‘guix pull’, no
upgrades for TeXmacs are reported—so far, so good.

However, once I actually run ‘guix upgrade’, Guix starts downloading
TeXmacs with all of its dependencies again, even though it's already
up-to-date on my computer. Should this be happening?

I don't know if it's related, but ‘guix weather’ shows that there are
no substitutes available for TeXmacs.

Best wishes
// Tirifto