Steps to Reproduce:

1. Try to locate a waterfall (in a ravine or cave) or a lavafall (in the nether)

Observed Results:
The flow will sometimes stop in chunk border leaving things like shown in the photos below

Expected Results:

The flow of the liquids should continue until they meet phisical barriers (blocks, water/lava pools, ect)

Notes:

On Java edition, naturally generated water/lava sources only start flowing after the chunk is generated for the first time. On bedrock, the flowing part is already there when generating, making me think that's the cause of the bug.