Unknown function: term_getstatus in ftplugin/nnn.vim

[sedimentation-fault]

Problem

Cloned nnn.vim (the directory) into
/usr/local/share/vim/plugin/
In my vimrc I have added /usr/local/share/vim to my runtimepath.
Upon start of vim (but NOT of gvim!) I get:

Error detected while processing BufEnter Autocommands for "<buffer=1>":
E117: Unknown function: term_getstatus

How to reproduce

See above.

Expected behavior

No error, of course.

Environment:

• OS: Gentoo Linux
• Terminal: x11-misc/tabbed-0.6-r1 with x11-terms/xterm-367
• Shell: app-shells/bash-5.1_p16
• Vim version: app-editors/vim-8.2.3741
• Plugin manager: None
• Plugin version: git clone of yesterday
• Nnn version: app-misc/nnn-4.8

[sedimentation-fault]

No ideas, even after a month? :-(

It seems that, while the function term_gestatus() is part of vim 8.2, as one can see with :help term_getstatus, it is called at a point too early in time. FWIW, directly after that error I get output from the syntastic plugin in my status line:

Error detected while processing BufEnter Autocommands for "<buffer=1>":
E117: Unknown function: term_getstatus
syntastic: 0.242815: g:syntastic_version = '3.10.0 (Vim 802, Linux)'
Press ENTER or type command to continue