Cannot find included file during preprocessing

Hello,
So I was recently tasked to update an old project, which uses dune, and I am not sure I fully grasp what is happening in one specific part.
The project was last used 2+ years ago with dune 1.8 and ocaml 4.09.0, which i updated to what I am now using; dune 3.8.0 and ocaml 5.0.0, as well as cppo 1.6.9.

When attempting to dune build, this happened:

File "dune", line 4, characters 22-54:
4 |   (preprocess (action (run %{bin:cppo}  %{input-file})))
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Error: File "ast.ml", line 613, characters 0-39
Error: Cannot find included file "visitorInternalDsl.ml"

Which dissappeared after i added (preprocessor_deps visitorInternalDsl.ml).
I then had the same error with ast.ml not finding some of the generated.ml templates:

File "dune", line 7, characters 22-54:
7 |   (preprocess (action (run %{bin:cppo}  %{input-file})))
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Error: File "ast.ml", line 616, characters 0-50
Error: Cannot find included file "templates/script.ml.generated.ml"

And I cannot seem to fix this one. So far I have tried:
Adding (source_tree _build/default/templates/) to the preprocessor_deps.
Adding (include_subdirs unqualified) to the dune file.
Modifying the path of the included file in ast.ml.
Using -I option in the cppo action.

My understanding is that I fail to specify to dune and/or cppo where it should look for the files, but even that may be wrong.

My dune file is:

(ocamllex lexer)
(menhir (flags ("--explain" "--dump")) (modules grammar))
(executable
  (preprocessor_deps visitorInternalDsl.ml)
  (preprocess (action (run %{bin:cppo}  %{input-file})))
  (name      parser)
  (libraries core))

An extract of ast.ml, where the problematic line is:

    method visit_script (my:script) = 
      #include "visitorInternalDsl.ml"

      (*INTERNAL DSL START*)
      #include "templates/script.ml.generated.ml"
      (*INTERNAL DSL STOP*)
      ht

My project tree is as follows:

.
├── ast.ml
├── _build
│   ├── default 
│   │   ├── ast.ml
│   │   ├── globals.ml
│   │   ├── globals.pp.ml
│   │   ├── grammar.mly
│   │   ├── grammar__mock.ml.mock
│   │   ├── grammar__mock.ml.pp.mock
│   │   ├── lexer.ml
│   │   ├── lexer.mll
│   │   ├── lexer.pp.ml
│   │   ├── parser.ml
│   │   ├── parser.pp.ml
│   │   ├── templates
│   │   │   ├── actions.ml
│   │   │   ├── actions.ml.generated.ml
│   │   │   └── every other template
│   │   └── visitorInternalDsl.ml
│   └── log
├── dune
├── dune-project
├── globals.ml
├── grammar.mly
├── io_externs.phaistos
├── lexer.mll
├── Makefile
├── merlin-init.sh
├── parser.ml
├── README.md
├── templates
│   ├── actions.ml
│   ├── arithmeticOp.ml
│   └── other templates
├── temp.txt
└── visitorInternalDsl.ml

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