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Ok, thanks for testing. Must be a conflict / something specific with my site. Will figure it out. Please feel free to mark as resolved.

Working as it should with purchased extension. My bad. Sorry for wasting your time on this. This can be marked as resolved.

Hi Anh,

I've switched to taxonomy_advanced, but issue of not saving selection persists. I have updated the example instance that I've given you access to for you to see.

Thanks for your detailed response, Anh. Unfortunately still not working for me.

I have disabled all plugins except Metabox and MB Blocks. I have also removed everything from my functions file except the above code to register the block.

I still end up with this (a single text input field): https://www.dropbox.com/s/7n7udh33841yg9g/Screenshot%202019-10-30%2015.16.09.png?dl=0

I will setup a test instance for you to access and send you the details as soon as it is ready.

Not sure if this helps, but here's my template for it. It is being rendered correctly, except that the actual field values are empty:

https://pastebin.com/s3TzxGxg

There's definitely a bug here. After moving the block in the visual editor (i.e. up or down in relation to other blocks), only then does it reflect the latest inputted data.

So I have to input data into the fields, then move the block up or down, and then save the post for it to stick.