you can no longer hold down the up and down buttons simultaneously to crouch while flying on mobile (If you were using the D-pad). This makes it a lot more difficult to place blocks on other interactable blocks.
I must also specify, this is NOT the same as MCPE-57531. This is something different entirely.
Thank you for your report!
We're tracking this issue in MCPE-167043, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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