Hi Marketo Nation,
The individual Activity Details for one of the logged events looks like this:
The Marketo Integration User has full edit level permissions for 4 of the 5 fields on the Lead and Opp objects, and read permissions for the same 4 fields on the Contact object.
Thanks for assisting!
These fields are not blank in SFDC, and I don't believe they were cleared prior. We just turned on field history tracking for the fields in question to ensure they weren't cleared at any point in SFDC.
The [null] issue has been happening to different records since early 2018. At least 1 of the same 5 fields are being overwritten in each case.
Are you confident the Marketo Integration User has read/write access to those fields? Could be causing the issue in that Marketo
1) Marketo tries to update a field
2) SFDC rejects the change
3) SFDC pushes back it's value of [null] into Marketo
4) Marketo is updated to [null]
We are also having this issue. A campaign changes their 'Person Status' in Marketo, but a SFDC Sync messes with it. It looks like it's being changed from [null] to "None" but the field was clearly changed to "Purchased List" 2 minutes prior.