Raspberry Pi 4B freezes on "suspend"

Hi there. I'm using Ubuntu Mate 20.04 on a Raspberry Pi 4B 8Gb RAM (overcloked to 2 Gh, with fan it's ultra stable and temp is never over 60). Everything is working fine and I'm very happy with it, but when I hit the "suspend" button everything freezes, it doesn't hybernate and it's impossible to resume the session. I have to force-reboot the Raspberry. Any idea whis this is happening? Thank you so much

I think Raspberry PI does not support suspending .... regards.

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Thank you very much, better knowing that I can't use this feature than going mad trying to understand what's going on