`plug.kak: Not loaded`, seems to be ignoring GitHub plugins too

[galexite]

I'm pretty new to Kakoune, though I've been trying it off and on for a while now, and I've used these plugins before.

I tried to set up a simple kakrc on Debian unstable, Kakoune v2020.01.16, kakoune 2020.01.16-2, with the following contents:

source "%val{config}/plugins/plug.kak/rc/plug.kak"

plug "andreyorst/fzf.kak"
plug "andreyorst/smarttab.kak"
plug "delapouite/kakoune-text-objects"
plug "jdugan6240/powerline.kak"
plug "robertmeta/plug.kak"

plug "kak-lsp/kak-lsp" do %{
    cargo install --locked --force --path .
}

colorscheme gruvbox

I've followed the instructions in the README, and cloned plug.kak with git clone https://github.com/robertmeta/plug.kak.git ~/.config/kak/plugins/plug.kak, but when I try to run :plug-install, I get this buffer, showing only two of my plugins:

kak-lsp/kak-lsp: Installed
plug.kak: Not loaded

Printed to the *debug* buffer, I get the errors mentioned in #2.

[galexite]

I originally thought the kakoune package was up to date (I read 2020 as 2021), but the issue still occurs with Kakoune built from the master branch.

[galexite]

After adding noload to the plug "robertmeta/plug.kak" line, both issues have been resolved.