I am testing Joomla 4.0 with JCE Editor Pro 2.9.11. There is an issue when using the keys ←↑→↓ to navigate through the text.
The keys ←→ are ok
With the keys ↑↓ the cursor stops at the end resp. at the beginning of each paragraph. You can navigate through the text within the current paragraph only. Once you have reached the end of a paragraph, you need to press →. This places the cursor into the following paragraph. Now ↓ works but not further than to the end of this paragraph.
Thank you and kind regards
Chris