org-mode Symbol’s function definition is void

I have been dealing with this issue for months, I use straight to manage emacs packages, so that I am always at the latest version of org mode. I am currently at org 9.5.3. I have been constantly dealing with a lot of missing function definitions. Most of them are due to compatibility reasons, e.g. some other packages depends on org-mode may use an old name for certain kind of functions. But this should not be an issue at all, because there is an "org-compat.el" which takes care of them. However, I find that, org-compat.el was never loaded in my emacs, even though I have (require 'org) in the first place, in org.el, org-compat was already required. I even tried to directly load the org-compat.el myself using (require 'org-compat). But none of the definition in the file was loaded. I wonder if that has anything to do with native-compilation. Anyone has an idea of how to fix this issue? I have to manually go to the org-compat.el file every single time after I restart emacs to make it works. Not only was org-compat.el not loaded, the org-macs.el was also not loaded. It has become a nightmare for me to use org-mode in the recent months.

First: you say org-compat was never loaded. Did you verify this with `(featurep 'org-compat)` returning nil? If so, try calling `M-x toggle-debug-on-error` and then evaluating `(require 'org-compat)`. Last idea for now: not sure this will work, but I'd try uninstalling and reinstalling Org, making sure that all byte- and native-compiled files are deleted before reinstalling.

If I use `(featurep 'org-compat)`, it evals into t. But let say there is a function, `org-file-name-concat` in org-compat, I cannot find it with C-h f. But if I manually go to the org-compat.el file and eval buffer, the function is then defined. It is stupidly weird. I believe that emacs thinks it has required org-compat, but in fact it does not. There is no error when I eval `(require 'org-compat)`. No debug is shown. I have rebuild the whole native-compiled files several times, did not help. Finally I have found a ugly solution, I load the file directly in my config. `(load "org-compat") (load "org-macs")` With these, the necessary functions are finally loaded. Not sure if it is a bug or not.

That really is weird. If you can provide a minimal reproducible recipe, starting with `emacs -Q`, then you may indeed have found a bug.

Most likely, you are partially loading built-in version of Org and its org-compat.el Try to put your straight-use-package org near the top of your config.

You are right. I originally put the org part in the bottom of my init. After I move it to the front, the issue was solved. Thank you so much. It is kind of embarrassing to make this kind of mistake.

You are not the first. This issue appears again and again every time new version of Org gets released. It was there back in 2011 (and got solved for package.el: https://list.orgmode.org/orgmode/81pqgh90sp.fsf@gmail.com/). It appears again with recent release: https://list.orgmode.org/orgmode/m25ytopjg9.fsf@blind-drunk.fritz.box/