Inconsistent behaviour when creating TPOS via API or GUI

[lightningcheckout]

When I create a TPOS via API with the following request (without TIP options):

{
  "wallet": "63230a322de94c21aa31539eb3f532ae",
  "name": "WithoutTips",
  "currency": "EUR"
}

The result is (with code 201)

{
  "id": "oCDkj2GxJdC8wkXPPhTDfZ",
  "wallet": "63230a322de94c21aa31539eb3f532ae",
  "name": "WithoutTips",
  "currency": "EUR",
  "tip_options": null,
  "tip_wallet": null,
  "withdrawlimit": null,
  "withdrawpin": null,
  "withdrawamt": 0,
  "withdrawtime": 0,
  "withdrawtimeopt": null,
  "withdrawbtwn": 10,
  "withdrawpremium": null,
  "withdrawpindisabled": false,
  "items": "[]"
}

When you now try to open this TPOS, it won't work. The error you got:
TypeError: tip_options is null

I have created a new TPOS, but now from the GUI and again without TIP options.

When I retrieve the TPOS's in the account, the result is:

[
  {
    "id": "oCDkj2GxJdC8wkXPPhTDfZ",
    "wallet": "63230a322de94c21aa31539eb3f532ae",
    "name": "WithoutTips",
    "currency": "EUR",
    "tip_options": null,
    "tip_wallet": null,
    "withdrawlimit": null,
    "withdrawpin": null,
    "withdrawamt": 0,
    "withdrawtime": 0,
    "withdrawtimeopt": null,
    "withdrawbtwn": 10,
    "withdrawpremium": null,
    "withdrawpindisabled": false,
    "items": "[]"
  },
  {
    "id": "6h9UhwjVeLoV2JirgCHYr2",
    "wallet": "63230a322de94c21aa31539eb3f532ae",
    "name": "test",
    "currency": "EUR",
    "tip_options": "[]",
    "tip_wallet": "",
    "withdrawlimit": null,
    "withdrawpin": null,
    "withdrawamt": 0,
    "withdrawtime": 0,
    "withdrawtimeopt": "",
    "withdrawbtwn": 10,
    "withdrawpremium": null,
    "withdrawpindisabled": false,
    "items": "[]"
  }
]

The second one, is via GUI. The tip_options and tip_wallet are stored in a different way then via the API.
Via API to me seems the best way, but that makes the TPOS not working.

This was just tested on legend (LNbits version: 0.12.0)

[lightningcheckout]

BTW, creating the POS from API with tip_options="[]", tip_wallet="" is a workaround for now.