This is a warning for the Oneplus 7 May update, during testing a bug was encountered during the first test update that has proven to be unreproducible.
Both the home and overview buttons stopped functioning after the update and required a factory reset to recover. All other functionality seemed unaffected by the issue.
As such, make sure to backup your data and if you encounter this issue, be prepared to do a factory reset and restore.
As the Oneplus 7 is still on LineageOS 17.1, and 17.1 is no longer officially supported by Lineage, this device may be discontinued at any time if other issues arise.