helm-do-ag breaks in hs-minor-mode on this specific source file

[Davidj361]

• Emacs version
  27.2
• Operating system
  Ubuntu 20.04
• Search command(ag, pt, ack etc) and version
  rg 11.0.2
• Last value of helm-ag--last-command
  ("rg" "--smart-case" "--no-heading" "--color=never" "--line-number" "--max-columns=512" "--ignore=.#" "--ignore=.o" "--ignore=~" "--ignore=.bin" "--ignore=.lbin" "--ignore=.so" "--ignore=.a" "--ignore=.ln" "--ignore=.blg" "--ignore=.bbl" "--ignore=.elc" "--ignore=.lof" "--ignore=.glo" "--ignore=.idx" "--ignore=.lot" "--ignore=.fmt" "--ignore=.tfm" "--ignore=.class" "--ignore=.fas"
  "--ignore=.lib" "--ignore=.mem" "--ignore=.x86f" "--ignore=.sparcf" "--ignore=.dfsl" "--ignore=.pfsl" "--ignore=.d64fsl" "--ignore=.p64fsl" "--ignore=.lx64fsl" "--ignore=.lx32fsl" "--ignore=.dx64fsl" "--ignore=.dx32fsl" "--ignore=.fx64fsl" "--ignore=.fx32fsl" "--ignore=.sx64fsl" "--ignore=.sx32fsl" "--ignore=.wx64fsl" "--ignore=.wx32fsl" "--ignore=.fasl" "--ignore=.ufsl"
  "--ignore=.fsl" "--ignore=.dxl" "--ignore=.lo" "--ignore=.la" "--ignore=.gmo" "--ignore=.mo" "--ignore=.toc" "--ignore=.aux" "--ignore=.cp" "--ignore=.fn" "--ignore=.ky" "--ignore=.pg" "--ignore=.tp" "--ignore=.vr" "--ignore=.cps" "--ignore=.fns" "--ignore=.kys" "--ignore=.pgs" "--ignore=.tps" "--ignore=.vrs" "--ignore=.pyc" "--ignore=*.pyo" "--ignore=SCCS" "--ignore=RCS"
  "--ignore=CVS" "--ignore=MCVS" "--ignore=.src" "--ignore=.svn" "--ignore=.git" "--ignore=.hg" "--ignore=.bzr" "--ignore=_MTN" "--ignore=_darcs" "--ignore={arch}" "supp")

Actual behavior

syl20bnr/spacemacs#15437

2022-03-31.16-23-44.mp4

Doing helm-do-ag in hs-minor-mode and searching for 'supp' in this code gives an error of:
Search failed: there is an unmatched expression somewhere or we are at the beginning/end of file. [4 times]

void foobar(Foo1 * foo1, Bar1 * bar2)
{
    if (((foo->supp)&&(foo1->sec || d.s ||
        (foo->offset &&
            (abs(bar2->sec) >=
          foo->offset)))) || ((!foo->supp) && (foo1->sec))){
}

A comment from the spacemacs issue:

The issue comes from hs-minor-mode which is used by helm internally which seems to have an issue with the open curly bracket.

The build in version of this package is used in spacemacs-evil therefore its active. Please open a bug report upstream.

Edit:
As a fast workaround you can disable this mode, then helm will not use it and the error should be gone.

Expected behavior

When I jump to the entry it should take me to the correct line such as line 3.

Steps to reproduce

1. Create /tmp/emacs
2. Create this file /tmp/emacs/.emacs

(setq-default indent-tabs-mode nil)

(require 'package)

(setq package-archives
      '(
        ;; ("gnu" . "https://elpa.gnu.org/packages/")
        ("melpa" . "https://melpa.org/packages/")
        ;; ("nongnu" . "https://elpa.nongnu.org/nongnu/")
        ))

(let ((my-pkgs '(helm helm-ag)))
  (when (seq-remove 'package-installed-p my-pkgs)
    (package-refresh-contents)
    (mapc (lambda (pkg) (package-install pkg t)) my-pkgs)))

(global-set-key (kbd "M-x") #'helm-M-x)
(global-set-key (kbd "C-x r b") #'helm-filtered-bookmarks)
(global-set-key (kbd "C-x C-f") #'helm-find-files)
(setq helm-ag-base-command "rg --smart-case --no-heading --color=never")

(helm-mode 1)

3. HOME=/tmp/emacs emacs
4. Open a test.c with the code above
5. Enable hs-minor-mode in buffer
6. helm-do-ag and search for 'supp'