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OS version: Windows 11, MacOS 26 (Tahoe), Zorin 18.1 (Linux)
App version: OnlyOffice Community Version 9.4.0
I almost abandoned OnlyOffice when this bug kept causing me to lose work, but it turns out my habit of using range names to make my formulae easier to read seems to contribute to the problem.
The problem seems to occur particularly quickly when I use vlookup() and use a range name for the lookup table instead of cell addresses.
I haven’t had this problem in other OnlyOffice editors yet, but I hope this helps spreadsheet users.