This has been happening to the horses on my realm for quite a while at this point, and it's getting very annoying because I keep losing my horse armor and saddles
I'm having the exact same issue on Android
For me, using the words "scarlet", "midnight", and "noob" caused the sign to turn blank
Like a lot of users, I was having issues with having my Switch freeze and having to reboot, but I also tried the archive method, and when I tried to upload my world, it got past the exporting screen, and had the error a minute or so into initializing, and when I checked the realm, it was the correct world. However, every time I go to the home screen and try to close Minecraft, my Switch freezes and I have to do reboot it.
I'd also like to add that when I try to download the world from my realm on Android, that the error message pops up, and it doesn't download it, but I'm still able to go into the realm itself.
I don't know about anyone else, but I've been experiencing random and lengthy lag issues with Minecraft on the switch for over 2 years. On occassion, the game will completely freeze, while still looking like it's functioning (block and environment animations continue to play, but the game won't acknowledge any of the controls), but more frequently, as in at least once every 10-20 minutes, I experience lag that causes weird glitching when placing blocks, and choppy movement. The lag lasts anywhere between 30 seconds to 2 minutes, and then the game is (seemingly) back to normal until the next time it lags. One specific lag issue I've experienced frequently is when exploring new chunks, I essentially have temporary x-ray vision, as I can see the water, lava, and tunnels underground for 5-15 seconds before the chunk finishes loading. I've made several tweets showing this is the past. Considering the switch is my only way of playing, and I adore the game as a whole, these issues have made the game increasingly harder to enjoy