I’ve found that when a Google Sheet cell contains a LET() function, and I have enabled the sync to convert to OpenDocument format, the LET function becomes lowercase, and LibreOffice Calc reports a #NAME? error. Simply changing “let” to “LET” fixes it.
I’ve noticed that if the expression contains other functions, those all remained uppercase, as in the original Google Sheet. Only the LET function became lowercase during the conversion to ODS.
Linux Mint 22.3
Insync for Linux version 3.9.8.60034
LibreOffice version 26.2.0.3 (Flatpak edition)
Yes, we use the Google API to allow communication with various Google services and their integration into Insync. We highly recommend filing a ticket with Google first so they can investigate why this feature breaks. They may be able to advise if you need to raise this with LibreOffice.