I tried to remove ISRC: USJT19900185
from http://musicbrainz.org/recording/666023bd-745f-4b38-bb15-325e61156fd0
in edit Edit #31536295 - Remove ISRC : http://musicbrainz.org/edit/31536295

But when I displayed open edits the target "Recording: Let's Dance" was grayed out.
As when the recording does not exist (following up a merge)
https://musicbrainz.org/recording/666023bd-745f-4b38-bb15-325e61156fd0/edits

This was following:
Edit #31518245 - Merge recordings: http://musicbrainz.org/edit/31518245
Edit #31518205 - Remove ISRC: http://musicbrainz.org/edit/31518205

Edit #31518245 - Merge recordings had passed before Edit #31518205 - Remove ISRC
This is why I was redoing it in Edit #31536295 - Remove ISRC
Edit #31518205 target "Recording: Let's Dance" displays rightfully as grayed out.

Conclusion:
It appears that if you try to display two edits for ISRC removal on the same page
in some cases the targets of both edits appear as grayed out when one of them is grayed out.