So, I was flying with my Elytra, chunks were loading while I was flying. Once I landed, I was able to clip through blocks like they were non-existent. It was the same for running too. Here's some evidence of clipping through blocks/half slabs.
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Thank you for your report!
We're actually already tracking this issue at MCPE-109925, so I will resolve and link this ticket 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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