After pressing enter after naming a section, the name is too faint (in dark mode). This seems to resolve itself after editing other elements in the whiteboard, and it also resolves itself after leaving the whiteboard and opening it again, so this is a fairly minor issue.
There was a separate issue where I tried to edit an already existing section name, and while the name window was active the text was invisible. I’m not sure if this is related, and I wasn’t able to consistently recreate the issue, but it seems to be when the section uses the default background color/filling.