Item reporting category appended to item categories

Questions
1

Upserting a catalog item as an entry in one category (a sub-category) and reporting category set to the parent category results in the item being an entry in the parent category in addition to the sub-category. The ordinal in the parent category is set to that of the ordinal in the reporting category which inevitably causes a collision with items actually at that ordinal in the parent category. (This is a recent regression since it never used to do this.)

For example, upsert request:

"categories": [
  {
    "id": "Y",
    "ordinal": 0
  }
],
"reporting_category": {
  "id": "X",
  "ordinal": 0
}

results in the following:

"categories": [
  {
    "id": "X",
    "ordinal": 0
  },
  {
    "id": "Y",
    "ordinal": 0
  }
],
"reporting_category": {
  "id": "X",
  "ordinal": 0
}

Why is the reporting category now affecting catalog categorisation?

2

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