amethyst shards in ancientcity chests in lieu of echo shards

MCPE BETA 1.19.0.26

SEED: 1221548812

ancientcity co-ordinates: (1202,-50,1143) [not chest co-ordinates]

i see amethyst shards in almost every chest. some chests don't contain echo shards at all. some chests contain 15 amethyst shards and 2 echo shards. see the ratio.

i thought it was a bug that amethyst shards replaced echo shards. I'm not sure if it is.