The bulk update request #8484 is active.

create alias art_collab (0) -> artist_collaboration (12061)
create alias art_collaboration (0) -> artist_collaboration (12061)
create alias multi-artist (0) -> artist_collaboration (12061)
create alias multi_artist (0) -> artist_collaboration (12061)
create alias multiple_artists (0) -> artist_collaboration (12061)
create implication multi-animator_project (8) -> artist_collaboration (12061)
change category artist_collaboration (12061) -> meta
mass update collaboration -> artist_collaboration
create alias collaboration_artist (0) -> artist_collaboration (12061)
create alias collab_art (0) -> artist_collaboration (12061)
change category collaboration (0) -> invalid

Reason: Add lines
mass update collaboration -> artist_collaboration alias collaboration_artist -> artist_collaboration category collaboration -> invalid
on top of Lister's draft.

The alias for collaboration_artist is so that artist_collaboration will show up in the autocomplete when typing just collaboration, similar to how pool_(swimming) is aliased so that swimming_pool shows up when searching for pool.

Invalidation of the tag is due to ambiguity (used for both collaborative and artist_collaboration)

EDIT: The bulk update request #8484 (forum #407968) has been approved by @spe.