User-Agent:       Mozilla/5.0 (X11; Linux x86_64; rv:88.0) Gecko/20100101
Firefox/88.0
Build Identifier: 

Hibernation stopped working after update 04 May 2020. 
DELL precision 5510. No BIOS updated.  

perhaps this output from dmesg|grep -i acpi could be useful:

[   15.214389] ACPI BIOS Error (bug): Could not resolve symbol
[\_SB.PCI0.LPCB.HEC.ECAV], AE_NOT_FOUND
[   15.214398] ACPI Error: Aborting method \_TZ.TZ01._TMP due to previous error
(AE_NOT_FOUND)

Reproducible: Always

Steps to Reproduce:
1. In gnome choose [suspend] ( it was hibernating to disk)
2.  
3.
Actual Results:  
the system doesn't hibernate to disk but by the next start boots a new

Expected Results:  
the system is hibernated to disk