When placing water sources on untouched land it flows out the 7/8 spaces in all directions. When building up a new surface, or modifying the previously working surface the water flow changes when the source block is placed. In my example pictures: I am building a multi tiered farm that worked in previous version years ago where a source block was blocked by a piston, when the piston releases the water it would cover the entire farm. In the current version the source block starts to flow and then goes in one or two directions only and does not cover the entire farm as it used it.
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GoldenHelmet
Thank you for your report!
We're tracking this issue in MCPE-30605, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
More information about water flow mechanics can be found on the Minecraft Wiki (link is below).
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This is how it always worked. Water in Minecraft prioritizes going towards lower elevations. If there is a hole or drop within range it will go there - as shown on first picture. It only spreads when there are no such holes - as shown on second picture.