tall flowers spawn inside caves on top of the grass if there was flower forest biome above

as you can see tall flower and small flower are generated inside caves if there was a dirt block under it and a flower forest biome above it 

in old versions i found some flowers under the caves but in small amouts

but as i can remember i have never saw tall flower rose bushs inside caves like this

seed:

8082958475863161342

XYZ:

-687.236/31.77234/-1373.815