Hi everyone!
I've had a lucky bamboo for over a year which was originally planted in soil but has since been growing in water. The plant was doing well but due to my stupidity of leaving it in a clear container it developed an algae problem after which I had to cut off its bottom to have it grow new roots.

It's been 7 months since then and the plant's been doing well. It grew new roots and I'm happy to say it even grew new leaves!

But recently about one and a half week ago, I've noticed that two of its branches have been turning orange. It's not like yellowing of leaves I've seen on other plants before. The leaves seem to be ok but the bottom of the branch is what seems to have turned orange? I've attached some pictures here:

But at the same time I'm worried if keeping it like that might cause it to rot and affect the stem of the plant.

I'd really appreciate any advice on what to do!

Also, I always use bottled water and change it every week, if that helps.

Thanks so much!