Jameson Logo addon messes up UI when loaded with presentation mode enabled

[PPPDUD]

With the line new IDE_Morph({"mode":"presentation"}).openIn(world); in snap.html (enables presentation mode upon load), Sparkle seems to mangle the UI in unwanted ways:

For context, here's what it looks like whenever the Jameson Logo addon isn't loaded:

[PPPDUD]

@Alessandrito123 Do you know how to fix this by any chance?

Edit: Further experimentation suggests that this is an issue with the "Jameson Logo" addon, so I'm transferring this issue.