Summary says it all.
Nothing can be done at the moment, wait for EAPI bump.
This can finally be fixed in EAPI 4.
Fixed in ess-5.12-r1, howm-1.3.9.1, and org-mode-5.12-r1.
(In reply to comment #3) > org-mode-5.12-r1 This should have been org-mode-7.4-r1.