Problem installing pidgin because it propagates gtk+@2

As reported by sss2 on IRC [1]. I can see this has changed recently, I

don't know why [2].

guix package -i pidgin spice-gtk --no-substitutes

The following package will be upgraded:

spice-gtk (dependencies or package changed)

The following package will be installed:

pidgin 2.14.1

The following derivations will be built:

/gnu/store/a4n2ankaiqv857dbaqj82bmmk6bmd6ha-spice-gtk-0.37.drv

/gnu/store/jh9z9mn9jz6744fyb3g3q5cn2nhhi65z-spice-gtk-0.37.tar.bz2.drv

building /gnu/store/jh9z9mn9jz6744fyb3g3q5cn2nhhi65z-spice-gtk-0.37.tar.bz2.drv...

downloading from https://spice-space.org/download/gtk/spice-gtk-0.37.tar.bz2...

building /gnu/store/a4n2ankaiqv857dbaqj82bmmk6bmd6ha-spice-gtk-0.37.drv...

guix package: error: profile contains conflicting entries for gtk+

guix package: error: first entry: gtk+@3.24.23 /gnu/store/1biqkwwsx20rbg8xm1y66qdj41h2jp4h-gtk+-3.24.23

guix package: error: ... propagated from spice-gtk@0.37

guix package: error: second entry: gtk+@2.24.32 /gnu/store/19av64kqzb9y9d9lfhqfy6bb4xl8z0zh-gtk+-2.24.32

guix package: error: ... propagated from pidgin@2.14.1

hint: Try upgrading both `spice-gtk' and `pidgin', or remove one of them from the profile.

1: http://logs.guix.gnu.org/guix/2021-01-04.log#212727

2: https://git.savannah.gnu.org/cgit/guix.git/commit/?id=3fd4477809caaeb6681999941f21baac14d87e84