pnpm not installing dev dependencies correctly(?) - karma-jasmine

Question

I'm trying to migrate some all projects to a monorepo with pnpm.
Here's the structure of my repo:
project1/
project2/
package.json
pnpm-workspace.yaml
...
Here's the content of project1/package.json
...
"devDependencies": {
"grunt": "^1.5.3",
"grunt-babel": "^8.0.0",
"grunt-cli": "^1.4.3",
"grunt-contrib-watch": "^1.1.0",
"grunt-exec": "^3.0.0",
"grunt-karma": "^4.0.2",
"istanbul-combine": "^0.3.0",
"jasmine": "^4.5.0",
"karma": "^6.4.1",
"karma-chrome-launcher": "^3.1.1",
"karma-cli": "^2.0.0",
"karma-coverage": "^2.2.0",
"karma-jasmine": "^5.1.0",
"karma-replacer-preprocessor": "0.0.2",
"karma-spec-reporter": "0.0.36"
}
project1/karma.conf.js
module.exports = function (config) {
config.set({
frameworks: ['jasmine'],
// list of files / patterns to load in the browser
files: ['*/*.js'],
// preprocess matching files before serving them to the browser
// available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
preprocessors: {
'./*.js': ['replacer', 'coverage'],
},
replacerPreprocessor: {
replacer (file, content) { /* ... */ },
},
// ...
});
};
If I run cd project1 && npm i, I can run the tests from the root with npm --prefix project1 run test.
However, if I remove the node_modules and use pnpm i instead of npm i, when i run the tests, I get a few errors:
Cannot load "replacer", it is not registered!
and
Server start failed on port 9876: Error: No provider for "framework:jasmine"! (Resolving: framework:jasmine)
I tried pnpm i --shamefully-hoist and adding auto-install-peers=true to ./npmrc but in vain... How can I fix this?