You cannot reach by a fence, iron bars or walls to access a chest. Formerly you could. Hoppers, copper rods and end rods are not affected by this bug. For example, if you are standing on a fence with a chest below it, you cannot open the chest without first removing the fence. The chest can still open, however the player cannot access it with the fence in the way.
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Glass panes are also affected. Note: if leaf blocks (or blocks the fence cannot attach to) are on the sides, this is not an issue, only when they are attached. This was definitely note the case before 1.20, as my cobblestone generator collection storage relies on reaching through. (easy enough to fix but it points that this is a bug, not intended).
Thank you for your report!
We're tracking this issue in MCPE-59920, so this ticket is being resolved and linked as a duplicate.
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I am not able to reproduce this. Can you attach a video of the issue?