When I press Enter on the signboard, after finishing editing, the Enter disappears and the text after it moves back to the first line, and the original Enter turns into a space. If the formatting on the first signboard is correct, the second one still has issues. (This happens in both English and Chinese)
Same issue on May 6, 2026 on latest bedrock version. When typing on a birch sign after formatting on all 4 lines, text defaults back to the very two lines (as if I had never hit enter between words).