getting a strange issue on a Lightning page. In the background, I'm trying to update a Long Text Area field with Apex (before update trigger) but it seems to throw this error whenever I try to update the value of that field.
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As everyone else noted, this is a known issue - apparently this is scheduled to be fixed by April 21, 2020 (that's what they told me in my Salesforce Case).
For the time being, the workaround I'm using is to change the Long Text Area field to a Rich Text field, it seems to have resolved the issue.