Im using MPB 13" 2017 and am having this problem since I upgraded to 10.15.4. I have installed every upgrade thereafter (10.15.4 supplement, 10.15.5, and 10.15.5 supplement) but the problem still persists. I tried every solution and workarounds suggested (changing the energy settings, resetting nvram/pram/ smc, booting on safe mode, using different account, used first aid in disk utility to repair the disk, used apple diagnostics to check hardware, reinstalled the macOS, erased disk and clean installed macOS. And still MAC Crashes. I AGAIN erased the disk, reinstalled the macOS clean, and just a while back it crashes. Apple support is now suggesting that it is hardware issue. I am thinking the bugs in Catalina created these defects in hardware. If there's someone there who thinks so, may be we should raise this to apple. It is not fair that we shoulder this unnecessary expenses because of their negligence.
I never took the time to reinstall macOS, I'm too busy at the moment.
I think it is a software issue, it doesn't crash every time so it has to be some weird combination of things happening while the Mac sleeps.
If they don't fix it with this release, I'm afraid we'll have to wait until October with the new macOS major version.