Onions Gone Squidgy

I sowed some onion sets in module pots a few months ago and put them in the coldframe. Ive only just got the ground ready for them and they have been in the pots far too long.
When i just inspected them i found that the actual onions have gone (for want of a better word) squishy.
It seems like the sets have sprouted then the onion has rotted. Im on the brink of throwing them away because i need the pots and the coldframe space but I thought I would ask you guys what you think? Cheers.

Thanks DD.
I had no idea that in the process of taking nutrients from the bulb that it would shrink and go soft. (every days a school day)
And yea, planted even! (Doh) 😅