The Seamless Donations shortcode quit working with WordPress 6.5

Of course I know that Seamless Donations is no longer supported, and it is recommended that we move to giveWP. I am currently evaluating my options to get off of Seamless Donations. However, in the meantime the seamless donations shortcode (i.e. ‘seamless-donations’ in square brackets) has quit working in WordPress 6.5 and above. Normally the page with the shortcode shows the donation forms. Now, no forms show at all on the page, as if the shortcode wasn’t even there. I am wondering if other SD users have seen the same problem, and can give a hint on how to fix it. I submitted a ticket to the SD support website (separate from this WP website), and the SD developer (David Gewirtz) told me that he can’t help me. So, I’m wondering if any other users out there have an idea how to fix this.