Fields with “dates“ handle won’t save for new entries

[cquinders]

Hi!

I observed an issue with a Matrix field in a Craft 3.3.16.3 site when PreparseField v1.1.0 is installed.

I have a Matrix field with a “dates“ handle in this Craft 3 site. Whenever I create a new entry with a matrix block inside the „dates“ field, the block is missing after saving the new entry.

If I add a matrix block to the “dates“ field of an existing entry and save it, everything works fine. Also, if I rename the “dates“ field to something different or uninstall the Prepare Field plugin it works with new entries too.

So there seems to be an issue with fields called “dates“ when creating new entries and using Preparse Field. Do you have any idea what causes this?

Thanks!