Hi Beetroot
As long as they're supported, it isn't a problem. If you bury the plants up to the first leaf joint (or where it used to be if it's fallen off) the stems should thicken up as the days go by and it will put out new roots from the stem into the compost.
I put mine in the growbag/pot extension contraptions when they get to about 8" tall, long before the first fruit truss develops. It's worked for me for years and I always get a good crop.

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