Nintendo has just released a list of Nintendo Switch 2 titles that may have problems with Nintendo Switch games. The list covers 3 tiers:
Games that are playable, but have some in-game compatibility issues.
Games with issues that are planned to be addressed by launch or shortly after.
Depending on what games you are currently playing or are in your backlog, it might be worth viewing the list to see what could be on your radar that you may want to hold off on.
With a little over a week before the Nintendo Switch 2 launches, this last should help you plan on bringing over your existing collection to the new system.
Source: Nintendo