SharePoint Lookup Column value not showing out of sudden

[alirnz]

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

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

Additional environment details

• browser version
• SPFx version
• Node.js version
• etc

Describe the bug / error

Hi, I have created a SharePoint list that comprised of 2 lookup columns. The list have been working fine for the past few months. However, from today, the list user reported there is issue with some of the lookup field, when trying to search the value in lookup it is unable to search and users are not able to fill forms

How do I solve this?

Steps to reproduce

1. Create new list
2. add a lookup field to another list
3. fill the form and you can not search values

Expected behavior

should load the value

[areestlc]

I am seeing the same issue across all our SharePoint environments

It looks like the call to the API endpoint SearchLookupFieldChoices is malformed when typing into the lookup search box:

Error is also showing up in the browser console: