I put some text in this coll. When I query them, some of the cell are prepended with 'symbol', others are not. When I reedit the coll data, it becomes normal again. Is it a bug??

is-it-a-bug-coll-query-strange-behavior

If the index or data is a single symbol max will prepend the output with "symbol" you can get rid of this with a [route symbol] as shown in the example below. I'm not sure why this would change when you edit the data in your [coll] and I can't tell from your example patch as you did not save the collection data with the patcher.

Is it a bug? coll query strange behavior