Yeah... just made sense that it didn't continue past prehistoric. I'm sure DH meant it to end at that point because animal images can only contribute to improved research from studying them for so long. Some things don't keep being better as time goes on and there's sometimes cause - this is one of those I think.
It always continued past Prehistoric era.
Scribe, Library, and University being present cause different values for subdued animals unit actions - mostly focus switches to culture
So it was issue with replacement, that was there for long time
It simply reverted to earlier present building, as that one was replaced.
Then it resumed once you got Scribe - you would again get higher culture and research in Ancient.
I guess it wasn't actually issue until replaced buildings got completely disabled.
Each of these get replaced by later versions.
OUTCOME_ANIMAL_RECORD_TALE_ORAL - available at start
OUTCOME_ANIMAL_RECORD_TALE_ORAL_STORY - BUILDING_STORYTELLERS_HUT - TECH_ORAL_TRADITION - X3
OUTCOME_ANIMAL_RECORD_TALE_ORAL_CAVE - BUILDING_CAVE_PAINTING - TECH_PETROGLYPHS - X8
OUTCOME_ANIMAL_RECORD_TALE_LASCAUX - BUILDING_LASCAUX_EFFECT - TECH_PETROGLYPHS - X8 - Only one civ can get it, as its from wonder.
OUTCOME_ANIMAL_RECORD_TALE_ORAL_FRESCO - BUILDING_FRESCO - TECH_IDEOGRAMS - X20
OUTCOME_ANIMAL_RECORD_TALE_SCRIBE - BUILDING_SCHOOL_OF_SCRIBES - TECH_WRITING - X28
OUTCOME_ANIMAL_RECORD_TALE_LIBRARY - BUILDING_LIBRARY - TECH_LITERATURE - X34
OUTCOME_ANIMAL_RECORD_TALE_UNIVERSITY - BUILDING_UNIVERSITY - TECH_EDUCATION - X48
So this fresco replacing cave painting degraded outcome to storyteller hut until you got scribes