Secondary players logging without inventory

You know. The secondary players have lost progress. My daughter can’t stand up her wolves in our family world it took 9 months to build, Gee. Thanks. What a waste of our time, money and fun. Absolutely gutted. It was a random intermittent fault but usually sorted with a shutdown restart but now all worlds all the time. We can mow only play alone and not together. It’s really really sad.