I did a simple amendment to a page (PHP) containing several Text Menus and all the menu items' start delimiters were shown as invalid characters.
I use the Bullet symbol as the start delimiter and it's been working fine for many years.
The odd thing is that if I change the page extension from PHP to HTML without changing anything else the Bullets show as normal.
For the demo version I've removed all objects from the page (including Link Styles) with just one Text Menu left.
The following two projects are identical except for the page extension.
https://www.mediafire.com/file/eh1bx7jw ... P.wbs/file
https://www.mediafire.com/file/g7jiww2t ... L.wbs/file
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BTW I'm using today's 17.0.5 version but the problem occurs with older versions so it's nothing to do with the update.