Coloured wool blocks lost their colours after update

After updating Minecraft PE on my iPad, my old Map which I've only just put on a new YouTube Channel, the coloured wool blocks seem to have lost their colours, and are now white blocks.  I haven't got a clue why this happened, as I've had this map for years.  I confirmed this also on Minecraft PE on an Android Tablet, and same thing happens after update, so I can only think it may be a bug.

I’ve side loaded an older version of Minecraft PE on my iPad v1.19.41, and when I use my map with this version, it has all the colour blocks as it should.  So, I have confirmed that it’s something to do with the new update.

It seems like all the coloured wool blocks, have been dyed to white.
I have five screenshots, two of my Map before it happened, and one after the update…
link to my map if you want to try…
https://www.dropbox.com/s/sd971h91ymivgs7/Minigames%20Central.mcworld?dl=0

Steps to reproduce ([Mod] EVGENSYPERPRO):

1. Import the world Minigames Central.mcworld.
2. Open in version 1.19.71+.
3. Look at the wool blocks in the world.

Observed results:
All wool blocks in the world have become white.

Expected results:
Blocks of wool should not turn white.

Notes:
The problem is not present in versions 1.19.63 and below.
When updating the world from version 1.19.63 to 1.19.71, only some wool blocks become white (in some chunks).