Filtering on a collectionlink

The collection-link works fine when using “multiple”: false but when using “multiple”: true i don’t get a response.

i tried things like:

{
  "filter": { "categories": {"display": "Projects"} },
  "populate": 0,
  "simple": 1
}

{
  "filter": { "categories": ["display": "Projects"] },
  "populate": 0,
  "simple": 1
}

{
  "filter": { "categories.display": ["Projects"] },
  "populate": 0,
  "simple": 1
}

But none of those result in a response that return the items