Yes. updating an OS right before a deadline is like buying new shoes just before a marathon. it’s not gonna end well.
@Barry mentioned that SU24 is mostly fine with Sequoia, however it’s the very first release of sequoia and the os itself has some bugs and kinks.
that’s why in general, it’s not worth it updating mac os before the second or third update.
beyond that what can we do ? not much. In layout’s preferences, are you using the new engine (experimental) or the old one ? can you try switching between both ?
if you export as pdf, do the weird artefacts remain ? or is it only when working in layout ?