I confirm that it has happened to me and continues often especially when I try installation on SNO with external db.
Unfortunately, I have not yet solved the error at the source.
Support once recommended this technote to me: Cert Manager fails to call webhook - IBM Documentation
Recently, however, I solved it by hand editing the contents of the secret "<mas-id>-<workspace-id>-jdbccfg-workspace-application-binding"
I hope one of them can in some way help you. If instead you find the source of the problem, please post it here