'_data' column existed before version 2.0 of the module. It was not storing argument and title values there before, because there were dedicated columns for them. But during update_8103 the data in column `_data` is overwritten and whatever was there is deleted.
I am not sure that this use case happens to everyone, but in my project I was using `_data` column to store additional settings, that are now made as plugins: pager limit, title override, etc. All the values were stored in that column.
During update_8103 merge existing values from `_data` column with argument and title values.
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Closed: duplicate
2.0
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Could you check if 🐛 Ajax pager - Input value "viewsreference" contains a non-scalar value Fixed solves the issue?
Closed as duplicate of 🐛 Update to 2.0 loses data from '_data' column Needs review .