Entering 1.15.0.51, chain command block(someone reported on 1.14 beta) and repeat command block is work but cannot be accessed to edit commands.I mean the repeat command block and chain command block cannot be able to type the command while impulse command block can be type to enter the UI.
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Thank you for your report!
However, this issue is a Duplicate of MCPE-63089.
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If a command block executes its command while you're trying to edit it, your changes will not be saved. This is a technical limitation.