After update to Jenkins 2.107.2 (from 2.89.4) most (but not all!) rebuild buttons are gone from the Blue Ocean UI (rebuild links in the classic UI are still there).
No error msg. I couldn't yet find out the pattern why the rebuild button is still there for some builds, but not anymore for others.
This happened with blue ocean plugin 1.4.2. In the mean time I've upgraded to 1.5.0, but this issue still persists.