does not work in emacs 30.1, no syntax highlighting available

[bitFiedler]

I installed via git because melpa packages are not compatible:

minimal config:
(require 'use-package)
(setq package-archives
'(("melpa" . "https://melpa.org/packages/"))
use-package-always-ensure t)

(package-initialize)

(require 'use-package-ensure)
(require 'quelpa-use-package)

(use-package ov
:quelpa (ov :fetcher github :repo "emacsorphanage/ov")
:ensure t
)

(use-package hide-lines
:quelpa (hide-lines :fetcher github :repo "vapniks/hide-lines")
:ensure t
)

(use-package syslog-mode
:quelpa (syslog-mode :fetcher github :repo "vapniks/syslog-mode")
:ensure t
:requires ov hide-lines
:after hide-lines ov
:config (syslog-mode)
:init (add-hook 'syslog-mode-hook 'display-line-numbers-mode)
)

after opening an syslog file and activate syslog-mode, there is no syntax highlighting