You might want to report a bug instead of posting in the Community Support forum. 😉 Also, could it be that this has to do with Rich Text fields, not Grid…? Or does it only work with Rich Text Fields inside Grid?
It has already been submitted as a bug.
And, yes the bug is with all Rich Text Fields.
@slither io want rather of making a post in the Community Support section, you might prefer to report a bug.
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