Hello,
This morning I was working in AGOL in a public layer that is editable. I am the owner and creator of the feature layer. I didnt change any editing settings, but now, whenever I try to edit a field, create, or delete a feature, I get an error. (ex: "Edits could not be saved: Invalid column name" or "Edits could not be saved: This SqlTransaction has completed; it is no longer usable.").
I only ever edited web applications and a dashboard that referenced / used this file. Any thoughts as to why I can no longer edit any data in the layer will be super appreciated!
I'd suggest to check the records in the feature layer to see if there are any suspicious values.
Someone came across the similar issue in the following post, it may be useful for you.