When you put a repeater, and then a repeater looking 90° to the left or to the right next to it, when you power the first one you placed, there will be a texture error.
Here's a video where it happens.
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duplicates 1
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This is actually an intended feature, called repeater locking. By powering the sides, you prevent the repeater from changing state, even if the block powering it changes. You can still change the delay, however.
Duplicate of MCPE-47002, which is working as intended. This is indeed a feature, not a bug.
Thank you for your report!
We're tracking this issue in MCPE-15307, 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.
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there is no bug regarding the textures, the repeater creates a bedrock textured bar when powered by another repeater at a 90 degree angle