The stem of the plant holds water, so it won't suffer that bad if you allow it some dry time. Just try to keep it warm as well. I don't know how long to allow dry time, you just got to observe. We have varying humidity levels and indoors it will take longer for the plant to dry out. On the other hand, sometimes the plant maybe needing some more water, if it is still young, so it is already having a softened part. You did say it has leaves already, so it is actively growing now, needs as much sun and also water.
If you have access to pumice, I would suggest adding some more pumice in your cacti media, if it raining more often on your side, just to further help in the drainage. I also use shallow and wide containers rather than tall and deep ones, so there is faster drying/draining time at root level.
Hope you get a photo!