Not accepted by UTC but in ISO ballot?

I was looking at the pipeline for something else, and for the first
time I see a character category: “not accepted by the UTC but in ISO
ballot” and two characters in it.

So IIUC while technically people are free to submit a document to the
ISO separately without submitting to UTC, it has always been the
practice to my knowledge to get a character approved by the UTC first.

Anyone throw some light on these particular cases?

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Shriramana Sharma ஶ்ரீரமணஶர்மா श्रीरमणशर्मा 𑀰𑁆𑀭𑀻𑀭𑀫𑀡𑀰𑀭𑁆𑀫𑀸