So I discovered this bug a bit over a year ago, so it has stayed in the game through multiple versions. It has hard to explain but repeaters seemingly change the way redstone interacts with other components. Basically here you can see the exact same redstone layouts, but one has a repeater directly after the button. This causes the redstone signal to not travel through a solid block. I've tested it multiple times on both my custom PC as well as my Android 7 phone and it seems to act like this consistently. Perhaps it would be easier to understand if you see it.
Please find attached some screenshots, as well as a short video showing the bug in action https://www.youtube.com/watch?v=yr2iRj54JYU
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Is this still an issue in the latest version? If so, can you add it to the affected versions?

Is this still an issue in the latest version? If so, can you add it to the affected versions?

Thank you for your report!
We're tracking this issue in MCPE-15793, so this ticket is being resolved and linked as a duplicate.
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Thank you for your report!
We're tracking this issue in MCPE-15793, 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.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki
-- I am a bot. This action was performed automatically! The ticket was resolved by one of our moderators, and I left this message to give more information to you.