This is a new issue i have found that if you add any number in the column name then the internal name of that column is very random. Its happening in Sharepoint Online, not sure if its there in on premise.
Example we have a column named 12Column then the internal name of that column is _x0031_2Column
This seems to be happening if we start a column name with a number.
When we check the column mapping from rest call to the list items we get the column tag as
<d:OData__x0031_2Column m:null="true" />
Not sure what can be done to handle this as i need to get this column as a filter for my rest call.
Any approach help is appreciated