[bug] if setl foldmethod=expr in ftplugin, this plugin cannot work

[Freed-Wu]

OS: linux 5.14 vi: nvim 0.5.0

test.vim:

let $XDG_CONFIG_HOME = $HOME . '/.config'
set runtimepath=$VIMRUNTIME
set runtimepath+=~/.local/share/nvim/repos/github.com/aperezdc/vim-template
set runtimepath+=~/.local/share/nvim/repos/github.com/pedrohdz/vim-yaml-folds/after
let g:templates_global_name_prefix = ''
let g:templates_directory = [$XDG_CONFIG_HOME . '/nvim/template']

test.yaml

---
repos:
  - repo: https://github.com/pre-commit/pre-commit-hooks
    rev: v2.4.0
    hooks:
      - id: trailing-whitespace
      - id: end-of-file-fixer
      - id: check-yaml
      - id: check-added-large-files
  - repo: https://github.com/frnmst/md-toc
    rev: 8.0.1
    hooks:
      - id: md-toc

$ vi -u test.vim test.yaml

Expected result:

---
repos:
  - repo: https://github.com/pre-commit/pre-commit-hooks
    rev: v2.4.0
    hooks:
      - id: trailing-whitespace
      - id: end-of-file-fixer
      - id: check-yaml
      - id: check-added-large-files
  - repo: https://github.com/frnmst/md-toc
    rev: 8.0.1
    hooks:
      - id: md-toc

However, the result is

---

I have found if delete setlocal fdm=expr in <~/.local/share/nvim/repos/github.com/pedrohdz/vim-yaml-folds/after/yaml/folding.vim>, this plugin can work.

Thanks!