Alembic assets fail to save after upgrading unreal 4.23 to 4.24

Hi, I have just upgraded unreal engine from 4.23 to 4.24.
I did as suggested, install teh newer version, then open my project and choose “open a copy” to let it copy the whole project

On opening my project in 4.24 My alembic assets didnt work well until I just re-imported them and now they are fine.
But when I do a save all, or save current I get the error message

The asset XXXXXX .uassset failed to save
cancel, retry or continue

This happens on every single alembic asset.
I’ve refereed to this thread…ailed-to-save=

But found its not the same issue and nothing is working.
Ive checked if the files are read only when unreal copied the project, I’ve then tried manually copying the files across to the new project folder and nothing works!?

Any advice greatly appreciated, it’s driving me mad.
Thank you very much

Anyone? :o

yeah same problem here!

In the end the alembic files still wouldn’t play back correctly, they would lag and break, so even after re-importing. But saving works on fresh alembics… but no good as alembics break

I sent a support request and they couldn’t duplicate the issue, I had to give up and go back to 4.23 where everything works perfectly.
… so I can never use a later version, this project is stuck in 4.23, which is really frustrating

for those having this problem, this is what I did to make it work:

you’ll be fine then.