It seems that this is still an issue for us. While we tested in the lab and a small sample in production without any issue with upgrading from 1703 to 1803, we decided to upgrade everyone to 1803. About half the computers we upgraded had an issue. Some failed the update, and others bluescreened after the update, and the only way to get back to Windows was to reset the BIOS to factory, and if you went back and changed anything in the BIOS (such as turning off fast boot), it would blue screen and you have to reset the BIOS again, and also some are on legacy boot but we cant turn them back to UEFI, but somehow they magically work.
Also the upgrade seems to change things in the BIOS, such as the selection for the M.2 drive. See screenshot below, it should say "M.2 Check Point Full Disk Encryption Windows Boot Manager". Our endpoints are on a mix of E80.84 and E80.86, and it happens for both versions.
Has anyone else had these same issues when upgrading to 1803 with Checkpoint FDE? I am also opening a case with TAC on this.