For Correlation ID, please use ULS viewer to get more clues:
Re-pulish the list form to compare the result.
Microsoft obviously hasn't deleted the Infopath functionality. It is set to stop supporting Infopath services in 2026.
This problem occured when i made a list from the modern Home page.
Once i created a list from the New->Dropdown->List, i could not upload new infopath forms to the sharepoint online list.
How i resolved the issue:
Create the list from ...
Here is how you can set the Web Application properties in PowerShell:
$app = Get-SPWebApplication http://whateverApp;
$app.MaxItemsPerThrottledOperation = 500000;
$app.MaxItemsPerThrottledOperationOverride = 500000;
$app.MaxQueryLookupFields = 15;