INVALID TAG message in Tile Wizard for Free Text tiles

Up until the most recent patch we applied (8.55.26) we have been able to use various bits of HTML in Free Text tiles.  Nothing too advanced, quite basic - used to alter the format of the text in the tile a little bit.

Now when I attempt to edit the text in the tile I am getting an error when saving:

INVALID TAG:div-Only whitelisted tags and attributes are allowed. h1=|h2=|h3=|h4=|h5=|h6=|br=|p=|b=|i=|img=src,width,height,alt. Image format should be %IMAGE(PSIMGOBJECT)

To allow other tags and attributes, it should be whiltelisted in its respective peoplecode field events.