Hello,
1 - The latest beta still ignores the “show invisibles” option. It must be manually deselected and the reselected every time.
2 - The spell checker still does not learn new words, or at least it continues to underline them in red.
Every time they update the beta, they update the release notes. These updated release notes include the LH numbers of the bugs they have fixed. If they’re not listed, the bug is not fixed but is still being tracked.