This was a reported bug on AHQ. It had been open for quite a while but was acknowledged by EA and last year they asked for additional info/saves (from PS). So they are aware of it. As part of the bug report players had sent in images of the problem. So since it's been brought to their attention, hopefully it will be addressed. It's affected my game since the start, in fact I had it with Sims 3 too funnily enough. There's nothing really that can be done to prevent it, I've just learned to check doors and windows before leaving build mode and click on them all to restore them before returning to live mode. If I do it as I'm building they'll only disappear again.
But they are definitely aware and hopefully we supplied enough info to get a fix at some point 🤞.
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