Prevent Minecraft lines from despawning?

In a Minecraft world (creative mode) I built an artificial river and a bridge over it, which I actually had already finished. It was a modern suspension rope bridge, a straight bridge, but with leashes attached to the pillars, which I then tied to bunnies. (Picture)

However, I then noticed that the lines were despawned. Does anyone know how to
-That can either prevent the lines from despawning or
-An alternate construction using leashes or whatever what looks like rope in Minecraft.
Thanks in advance, LG Blovu ;-)

You can leash rabbits with name tags

Thanks ;-)
I could have got the idea too…

Ok, that doesn't work. But the problem is not because the rabbit is not tamed, the lines just become invisible

Which version are you playing?

I suppose you play Bedrock. It is quite normal for the lines to disappear when you move away a little. As far as I know, the problem can't be solved.

I have erased the world now, who is so stupid to play Bedrock, please?
From version 1.15 the bug was fixed, I haven't built that much in the world now, so I'm building another world in the latest version

I play bedrock!

Why please? In Java, you have access to so many more servers and you can build redstone circuits in a more complex way because they work better there.

In any case, I think it's worth the few euro more

Personally, however, I do not build red tone circuits. I also find this fuss about Bedrock and Java pointless. There are different opinions and that's a good thing. So I don't care if I play with Java or Bedrock.