TaxCatchAll column restricted to 2 values

Target SharePoint environment

SharePoint Online

What SharePoint development model, framework, SDK or API is this about?

💥 SharePoint Framework

Developer environment

None

What browser(s) / client(s) have you tested

• 💥 Internet Explorer
• 💥 Microsoft Edge
• 💥 Google Chrome
• 💥 FireFox
• 💥 Safari
• mobile (iOS/iPadOS)
• mobile (Android)
• not applicable
• other (enter in the "Additional environment details" area below)

Additional environment details

Describe the bug / error

It seems, that the return value for the TaxCatchAll column in a SharePoint list is now limited two a maximum of 2 values.
I have a list that contains 4 taxonomy columns. All these 4 columns are filled with data.
When I read listitems using PnPJS with a query that contains $select=TaxCatchAll/IdForTerm and $expand=TaxCatchAll the resulting TaxCatchAll property is always an array consisting of 2 values (always the same 2). The other 2 values are missing, which is a problem because I need to filter on them. But the $filter doesn't work either, because the relevant column's value is not in TaxCatchAll.
Example result record:

{
            "odata.type": "SP.Data.SnsAbsencesListItem",
            "odata.id": "b0e79b9c-5650-4ef1-9c89-80061d26d5d5",
            "odata.etag": "\"22\"",
            "odata.editLink": "Web/Lists(guid'610a758c-466c-4544-8d55-93ed643dc2ba')/Items(6255)",
            "snsRequestEmployee@odata.navigationLinkUrl": "Web/Lists(guid'610a758c-466c-4544-8d55-93ed643dc2ba')/Items(6255)/snsRequestEmployee",
            "snsRequestEmployee": {
                "odata.type": "SP.Data.UserInfoItem",
                "odata.id": "414b16b3-d530-4478-a975-cda1d84187fd",
                "Title": "User One",
                "Id": 8
            },
            "TaxCatchAll@odata.navigationLinkUrl": "Web/Lists(guid'610a758c-466c-4544-8d55-93ed643dc2ba')/Items(6255)/TaxCatchAll",
            "TaxCatchAll": [
                {
                    "odata.type": "SP.Data.TaxonomyHiddenListListItem",
                    "odata.id": "bcaaf4aa-461a-4db1-aab2-0f96dafe8f46",
                    "IdForTerm": "a7807ac6-a2d1-4675-8302-3e9869cfbcdb"
                },
                {
                    "odata.type": "SP.Data.TaxonomyHiddenListListItem",
                    "odata.id": "c0c73e0a-350a-48bb-96e5-afda95dbd42c",
                    "IdForTerm": "01e02242-9aab-4d3e-acfc-040e05554478"
                }
            ],
            "snsAbsenceRepresentative@odata.navigationLinkUrl": "Web/Lists(guid'610a758c-466c-4544-8d55-93ed643dc2ba')/Items(6255)/snsAbsenceRepresentative",
            "snsAbsenceRepresentative": [
                {
                    "odata.type": "SP.Data.UserInfoItem",
                    "odata.id": "945b1741-0035-4de3-96a7-6921626c13d5",
                    "Title": "User One",
                    "Id": 8
                }
            ],
            "snsRequestApprover1@odata.navigationLinkUrl": "Web/Lists(guid'610a758c-466c-4544-8d55-93ed643dc2ba')/Items(6255)/snsRequestApprover1",
            "snsRequestApprover1": {
                "odata.type": "SP.Data.UserInfoItem",
                "odata.id": "3ac3a765-8d9f-487b-8e44-5752b085c5ec",
                "Title": "User One",
                "Id": 8
            },
            "snsRequestApprover2@odata.navigationLinkUrl": "Web/Lists(guid'610a758c-466c-4544-8d55-93ed643dc2ba')/Items(6255)/snsRequestApprover2",
            "snsAbsenceDepartment1": "IT",
            "snsAbsenceStartDate": "2025-07-29T10:00:00Z",
            "snsAbsenceEndDate": "2025-07-29T10:00:00Z",
            "snsAbsenceAbsenceType": {
                "Label": "13",
                "TermGuid": "a7807ac6-a2d1-4675-8302-3e9869cfbcdb",
                "WssId": 13
            },
            "snsRequestStatus": {
                "Label": "8",
                "TermGuid": "1aa7abe1-bad7-46f8-8440-7b1f09e99c1d",
                "WssId": 8
            },
            "snsAbsenceWorkingDays": 1.0
}

As you can see, there's a column named "snsRequestStatus" with a TermGuid of "1aa7abe1-bad7-46f8-8440-7b1f09e99c1d" which is nowhere to be found in TaxCatchAll. The first value in TaxCatchAll corresponds to the "snsAbsenceAbsenceType" column. The second one is from a column which is not in $select. "snsRequestStatus" ist completely missing and also the fourth taxonomy column of the listitem which is also not in $select.
Is this an official limitation of TaxCatchAll or is it a bug?

Steps to reproduce

1. Create a list with more than 2 taxonomy columns.
2. Add a list item with values for all taxonomy columns.
3. Request the list item through PnPJS (REST API?) including the hidden TaxCatchAll column
   => TaxCatchAll shows only 2 entries.

Expected behavior

I would expect that TaxCatchAll contains the values for all taxonomy columns, not only 2.